WO2018139169A1

WO2018139169A1 - Camera system, camera, interchangeable lens, and method for determining camera system compatibility

Info

Publication number: WO2018139169A1
Application number: PCT/JP2017/047321
Authority: WO
Inventors: 賢司今村
Original assignee: 富士フイルム株式会社
Priority date: 2017-01-27
Filing date: 2017-12-28
Publication date: 2018-08-02
Also published as: US20190306412A1; DE112017006938T5; JP6571888B2; US20220256078A1; US11722766B2; US20200382698A1; US10785408B2; CN110226125B; DE112017006938B4; US11336821B2; JPWO2018139169A1; CN110226125A

Abstract

Provided are a camera system, a camera, an interchangeable lens, and a method for determining camera system compatibility, with which it is possible to easily and quickly determine compatibility between a camera and an interchangeable lens. An 11th terminal (CC11) provided to a camera (10) and an 11th terminal (LC11) provided to an interchangeable lens (100) are constituted by terminals capable of open drain output. The camera-side 11th terminal (CC11) is set to a first polarity if the camera (10) corresponds to a specific function, and is set to a second polarity if the camera (10) does not correspond. The interchangeable-lens-side 11th terminal (LC11) is set to the first polarity if the interchangeable lens (100) corresponds to a specific function, and is set to the second polarity if the interchangeable lens (100) does not correspond. The mutually connected camera-side 11th terminal (CC11) and interchangeable-lens-side 11th terminal (LC11) are the first polarity only if both are set to the first polarity. Accordingly, by detecting the polarity of the camera-side 11th terminal (CC11) and the polarity of the interchangeable-lens-side 11th terminal (LC11), both the camera (10) and the interchangeable lens (100) can determine whether there is compatibility.

Description

Camera system, camera, interchangeable lens, and camera system compatibility determination method

The present invention relates to an interchangeable lens camera system, a camera, an interchangeable lens, and a compatibility determination method thereof.

In the interchangeable lens camera system, the camera and the interchangeable lens are used in various combinations. As a result, a new type camera and an old type interchangeable lens may be used in combination.

∙ New types of cameras may have new functions. In this case, the old types of interchangeable lenses may not be able to use the functions. Similarly, the functions installed in the new type of interchangeable lens may not be used with the old type camera.

For this reason, in the interchangeable lens camera system, the compatibility of both the camera and the interchangeable lens is determined at startup. For example, the camera system described in Patent Document 1 has a configuration in which predetermined information is transmitted and received between the camera and the interchangeable lens at the time of activation to determine compatibility.

JP 2010-204430 A

However, in a configuration in which predetermined information is transmitted and received between the camera and the interchangeable lens and compatibility is determined as in the camera system described in Patent Document 1, communication is established between the camera and the interchangeable lens. Or it is necessary to send and receive information to / from each other, and there is a drawback that it takes time for the determination. As a result, there is a drawback that it takes time to start.

The present invention has been made in view of such circumstances, and a camera system, a camera, an interchangeable lens, and a compatibility determination method for a camera system that can easily and quickly determine compatibility between a camera and an interchangeable lens. The purpose is to provide.

Measures for solving the above problems are as follows.

(1) A camera system including a camera and an interchangeable lens that is detachably attached to the camera, wherein the camera has a camera-side communication terminal and a camera-side communication terminal having a first polarity or a second polarity. The camera side communication terminal polarity setting unit is set to the first polarity when the camera is compatible with a specific function, and is set to the second polarity when the camera is not compatible. An interchangeable lens, comprising: a polarity setting unit; and a camera side determination unit that detects the polarity of the communication terminal on the camera side and determines that the interchangeable lens corresponds to a specific function when the detected polarity is the first polarity. Is a lens side communication terminal connected to the camera side communication terminal when attached to the camera, and a lens side communication terminal polarity setting unit for setting the polarity of the lens side communication terminal to the first polarity or the second polarity. , Interchangeable lenses are specific When the function is supported, the first polarity is set. When the function is not supported, the lens side communication terminal polarity setting unit to be set to the second polarity and the polarity of the lens side communication terminal are detected. A lens-side determination unit that determines that the camera corresponds to a specific function in the case of the first polarity, and the camera-side communication terminal and the lens-side communication terminal are both connected in the first state. A camera system in which both are first polarities only when set to polarities, and both are second polarities when at least one is set to second polarities.

According to this aspect, compatibility is determined based on the polarities of the camera side communication terminal and the lens side communication terminal. Here, the camera side communication terminal and the lens side communication terminal are both set to the first polarity only when both are set to the first polarity while being connected to each other, and at least one is set to the second polarity. In the case of both, the operation of the second polarity is performed. It functions as a so-called logical product. Such a function can be realized, for example, by configuring the camera side communication terminal and the lens side communication terminal with terminals capable of open drain output. When the camera is compatible with a specific function, the polarity of the camera side communication terminal is set to the first polarity, and when the camera is not compatible, the polarity of the camera side communication terminal is set to the second polarity. . The same applies to the interchangeable lens. When the lens itself is compatible with a specific function, the polarity of the lens side communication terminal is set to the first polarity, and when the lens is not compatible, the polarity of the lens side communication terminal is the second polarity. Set to polarity. In this case, only when both the camera and the interchangeable lens support a specific function, the polarity of the camera side communication terminal and the lens side communication terminal becomes the first polarity. Otherwise, it is the second polarity. Therefore, compatibility can be determined by determining the polarity states of the camera side communication terminal and the lens side communication terminal. That is, it can be determined that the camera-side communication terminal and the lens-side communication terminal are compatible when the polarity is the first polarity and not compatible when the polarity is the second polarity. The case of no compatibility is a case where at least one of the camera and the interchangeable lens does not support a specific function. Thus, according to this aspect, since compatibility can be determined based on the polarities of the camera side communication terminal and the lens side communication terminal, compatibility between the camera and the interchangeable lens can be determined easily and quickly.

(2) The camera side communication terminal and the lens side communication terminal are each one of a plurality of terminals used when the camera and the interchangeable lens perform serial communication. The camera is exchanged after the determination by the camera side determination unit. The camera-side communication setting unit further performs communication setting of a plurality of terminals used for serial communication with the lens, and the interchangeable lens has a plurality of terminals used for serial communication with the camera after determination by the lens-side determination unit. The camera system according to (1), further including a lens side communication setting unit configured to perform the communication setting.

According to this aspect, compatibility is determined using one of a plurality of terminals used when the camera and the interchangeable lens perform serial communication as the camera side communication terminal and the lens side communication terminal. Thereby, it is not necessary to separately provide a camera side communication terminal and a lens side communication terminal, and the configuration can be simplified. The terminals used as the camera-side communication terminal and the lens-side communication terminal are used for communication, which is the original application, after determining compatibility.

(3) The above-described (1) or (1) further includes an accessory that is detachably mounted between the camera and the interchangeable lens, and the specific function is a function of communicating with the mounted accessory when the accessory is mounted. (2) Camera system.

According to this aspect, the camera system includes an accessory. As for the camera and the interchangeable lens, the presence / absence of a function to communicate with the attached accessory is determined as the presence / absence of a specific function. Thereby, when an accessory is mounted | worn, it can be determined easily and rapidly whether a camera and an interchangeable lens can communicate with an accessory.

(4) The camera further includes a camera-side extended communication terminal, the interchangeable lens further includes a lens-side extended communication terminal that is connected to the camera-side extended communication terminal when attached to the camera, and the accessory is attached to the camera. An accessory-side first extended communication terminal connected to the camera-side extended communication terminal when connected, and an accessory-side second extended communication terminal connected to the lens-side extended communication terminal when the interchangeable lens is attached. When the interchangeable lens is directly attached to the camera, the camera and the interchangeable lens communicate via the camera side extended communication terminal and the lens side extended communication terminal, and the accessory is attached. When both correspond to a specific function, the camera and the accessory are connected via the camera side extended communication terminal and the accessory side first extended communication terminal. Communicate, exchange lenses and accessories communicate via the lens-side extended communication terminals and accessories side second extended communication terminal, a camera system of the above (3).

According to this aspect, the camera is provided with the camera side extended communication terminal, and the interchangeable lens is provided with the lens side extended communication terminal. The camera side extended communication terminal and the lens side extended communication terminal are connected to each other when the interchangeable lens is attached to the camera. When the interchangeable lens is directly attached to the camera, the camera and the interchangeable lens communicate via the camera side extended communication terminal and the lens side extended communication terminal. The accessories include an accessory-side first extended communication terminal connected to the camera-side extended communication terminal when attached to the camera, and an accessory connected to the lens-side extended communication terminal when the interchangeable lens is attached. Side second extended communication terminal is provided. When the accessory is attached and both the camera and the interchangeable lens support a specific function, that is, when both support the function of communicating with the accessory, the camera and the accessory are on the camera side. Communication is performed via the extended communication terminal and the accessory-side first extended communication terminal. The interchangeable lens and the accessory communicate via the lens side extended communication terminal and the accessory side second extended communication terminal.

(5) When an accessory is attached and both the camera and the interchangeable lens support a specific function, the camera is connected via the camera side extended communication terminal and the accessory side first extended communication terminal. (4) The camera system which communicates with and acquires the information of an accessory from an accessory.

According to this aspect, when an accessory is mounted and both the camera and the interchangeable lens support a specific function, that is, when both support the function of communicating with the accessory, the camera Communicates with the accessory via the camera side extended communication terminal and the accessory side first extended communication terminal, and acquires information on the accessory from the accessory. Thereby, the accessory information can be acquired on the camera side.

(6) When an accessory is attached and both the camera and the interchangeable lens support a specific function, the interchangeable lens is connected via the lens side extended communication terminal and the accessory side second extended communication terminal. Communicate with the accessory, send information about the interchangeable lens to the accessory, the accessory communicates with the camera via the accessory-side first extended communication terminal and the camera-side extended communication terminal, and the information on the interchangeable lens received from the interchangeable lens The camera system according to (5), wherein the information is added and transmitted to the camera.

According to this aspect, when an accessory is attached and both the camera and the interchangeable lens support a specific function, that is, when both support the function of communicating with the accessory, the replacement The lens communicates with the accessory via the lens side extended communication terminal and the accessory side second extended communication terminal, and transmits information on the interchangeable lens to the accessory. The accessory communicates with the camera via the accessory-side first extended communication terminal and the camera-side extended communication terminal, adds the accessory information to the information on the interchangeable lens received from the interchangeable lens, and transmits the information to the camera. Thereby, the information of an interchangeable lens and accessories can be acquired at once on the camera side.

(7) After acquiring information about the accessory, the camera communicates with the interchangeable lens through the camera side extended communication terminal, the accessory side first extended communication terminal, the accessory side second extended communication terminal, and the lens side extended communication terminal, The camera system according to (5) or (6), wherein information on the state of the interchangeable lens is acquired from the interchangeable lens.

According to this aspect, after acquiring the accessory information, the camera is connected to the interchangeable lens via the camera side extended communication terminal, the accessory side first extended communication terminal, the accessory side second extended communication terminal, and the lens side extended communication terminal. Communicate and obtain information on the status of the interchangeable lens from the interchangeable lens. Thereby, the extended communication terminal can be effectively used even after acquiring the accessory information.

(8) The interchangeable lens further includes a lens side extended communication terminal polarity setting unit that sets the polarity of the lens side extended communication terminal to the first polarity, and the accessory sets the polarity of the accessory side first extended communication terminal to the second polarity. The accessory-side first extended communication terminal polarity setting unit to be set is further included. The camera further includes an accessory detection unit that detects the polarity of the camera-side extended communication terminal and detects attachment of the accessory. If the polarity of the side extended communication terminal is the first polarity, it is determined that the accessory is attached. If the polarity of the camera side extended communication terminal is the second polarity, it is determined that the accessory is not attached. The camera system according to any one of (4) to (7), wherein the mounting is detected.

According to this aspect, the lens side extended communication terminal polarity setting unit that sets the polarity of the lens side extended communication terminal to the first polarity, and the accessory side first that sets the polarity of the accessory side first extended communication terminal to the second polarity. And an extended communication terminal polarity setting unit. The camera detects the attachment of the accessory by detecting the polarity of the camera side extended communication terminal. Specifically, when the polarity of the camera side extended communication terminal is the first polarity, it is determined that the accessory is attached. When the polarity of the camera side extended communication terminal is the second polarity, the accessory is not attached. Judgment and detection of attachment of accessories. Thereby, the presence or absence of attachment of an accessory can be detected easily and quickly.

(9) A camera in which an interchangeable lens is detachably mounted, and when the interchangeable lens is mounted, a camera-side communication terminal connected to a lens-side communication terminal provided in the interchangeable lens, and a camera-side communication terminal A camera-side communication terminal polarity setting unit that sets the polarity to the first polarity or the second polarity, and is set to the first polarity when the camera supports a specific function, and the first when the camera does not support the specific function. The camera side communication terminal polarity setting unit that sets two polarities, and the camera side that detects the polarity of the camera side communication terminal and determines that the interchangeable lens corresponds to a specific function when the detected polarity is the first polarity When the interchangeable lens is compatible with a specific function, the polarity of the lens side communication terminal is set to the first polarity, and when the interchangeable lens is not compatible, the polarity of the lens side communication terminal is the second polarity. The polarity is set and the camera Both the terminal and the lens side communication terminal are set to the first polarity when both are connected to each other, and both are set to the first polarity, and both are set to the second polarity when at least one is set to the second polarity. Camera with second polarity.

According to this aspect, since compatibility can be determined based on the polarity of the camera side communication terminal, compatibility with the interchangeable lens can be determined easily and quickly.

(10) The camera side communication terminal is one of a plurality of terminals used when the camera performs serial communication with the interchangeable lens, and is used when serially communicating with the interchangeable lens after determination by the camera side determination unit. The camera according to (9), further including a camera side communication setting unit configured to perform communication settings of a plurality of terminals.

According to this aspect, compatibility is determined using one of a plurality of terminals used when the camera performs serial communication with the interchangeable lens as the camera-side communication terminal. This eliminates the need for a separate camera-side communication terminal and simplifies the configuration. The terminal used as the camera side communication terminal is used for communication which is the original purpose after the compatibility determination.

(11) An interchangeable lens that is detachably attached to the camera, and when attached to the camera, the polarity of the lens side communication terminal connected to the camera side communication terminal provided in the camera and the polarity of the lens side communication terminal A lens-side communication terminal polarity setting unit that sets the first polarity or the second polarity. When the interchangeable lens supports a specific function, the interchangeable lens is set to the first polarity. A lens-side communication terminal polarity setting unit that sets the polarity, and a lens-side determination unit that detects the polarity of the lens-side communication terminal and determines that the camera corresponds to a specific function when the detected polarity is the first polarity When the camera is compatible with a specific function, the polarity of the camera side communication terminal is set to the first polarity, and when the camera is not compatible, the polarity of the camera side communication terminal is set to the second polarity. Camera side communication terminal and Only when both terminals are set to the first polarity when connected to each other, both terminals are set to the first polarity, and when at least one is set to the second polarity, both are set to the second polarity. Polarized interchangeable lens.

According to this aspect, since compatibility can be determined based on the polarity of the lens side communication terminal, compatibility with the camera can be determined easily and quickly.

(12) The lens side communication terminal is one of a plurality of terminals used when the interchangeable lens performs serial communication with the camera, and a plurality of terminals used when performing serial communication with the camera after determination by the lens side determination unit. The interchangeable lens according to (11), further including a lens side communication setting unit configured to perform communication setting of the terminal.

According to this aspect, compatibility is determined using one of a plurality of terminals used when the interchangeable lens performs serial communication with the camera as the lens-side communication terminal. Accordingly, it is not necessary to separately provide a lens side communication terminal, and the configuration can be simplified. The terminal used as the lens side communication terminal is used for communication which is the original purpose after the compatibility is determined.

(13) A compatibility determination method for a camera system including a camera and an interchangeable lens that is detachably attached to the camera, the step of attaching the interchangeable lens to the camera, and camera-side communication provided in the camera A step of setting the polarity of the terminal to the first polarity or the second polarity, where the camera is set to the first polarity when it corresponds to a specific function, and is set to the second polarity when it does not correspond And a step of setting the polarity of the lens side communication terminal provided in the interchangeable lens to the first polarity or the second polarity, and when the interchangeable lens supports a specific function, the polarity is set to the first polarity. Setting and setting to the second polarity if not compatible, and determining whether or not the interchangeable lens attached to the camera supports a specific function based on the polarity of the camera side communication terminal A step of determining that the interchangeable lens corresponds to a specific function when the polarity of the camera side communication terminal is the first polarity, and a camera on which the interchangeable lens is mounted based on the polarity of the lens side communication terminal Determining whether the camera corresponds to a specific function when the lens side communication terminal has a first polarity. When the camera side communication terminal and the lens side communication terminal are both connected to each other and set to the first polarity, both are set to the first polarity, and at least one is set to the second polarity. Is a camera system compatibility determination method in which both are of the second polarity.

According to this aspect, when the camera supports a specific function, the polarity of the camera side communication terminal is set to the first polarity, and when it does not support, the second polarity is set. Further, when the interchangeable lens supports a specific function, the polarity of the lens side communication terminal is set to the first polarity, and when it does not support, the second polarity is set. Here, the camera side communication terminal and the lens side communication terminal are both set to the first polarity only when both are set to the first polarity while being connected to each other, and at least one is set to the second polarity. In both cases, both have the second polarity. Therefore, compatibility can be determined by determining the polarity states of the camera side communication terminal and the lens side communication terminal. Specifically, on the camera side, it is determined that the interchangeable lens corresponds to a specific function only when the polarity of the camera side communication terminal is the first polarity. On the interchangeable lens side, it is determined that the camera supports a specific function only when the polarity of the lens side communication terminal is the first polarity. Thus, according to this aspect, since compatibility can be determined based on the polarities of the camera side communication terminal and the lens side communication terminal, compatibility between the camera and the interchangeable lens can be determined easily and quickly.

(14) The camera side communication terminal and the lens side communication terminal are one of a plurality of terminals used when the camera and the interchangeable lens perform serial communication, and the interchangeable lens attached to the camera corresponds to a specific function. A plurality of units used for serial communication between the camera and the interchangeable lens after the step of determining whether or not the camera to which the interchangeable lens is attached corresponds to the specific function. (13) The camera system compatibility determination method according to (13), further including a step of setting communication of a terminal.

(15) The camera system further includes an accessory that is detachably mounted between the camera and the interchangeable lens, and the specific function is the accessory that is mounted when the accessory is mounted between the camera and the interchangeable lens. The camera system compatibility determination method according to (13) or (14), which is a function of communicating with a camera.

(16) When an accessory is attached and both the camera and the interchangeable lens support a specific function, the camera side extended communication terminal provided in the camera and the accessory side first provided in the accessory The camera and the accessory communicate via the extended communication terminal, and the interchangeable lens and the accessory communicate via the lens side extended communication terminal provided on the interchangeable lens and the accessory side second extended communication terminal provided on the accessory. A compatibility determination method for a camera system according to the above (15).

According to this aspect, when an accessory is mounted and both the camera and the interchangeable lens support a specific function, that is, when both support the function of communicating with the accessory, the camera And the accessory communicate via the camera side extended communication terminal and the accessory side first extended communication terminal. The interchangeable lens and the accessory communicate via the lens side extended communication terminal and the accessory side second extended communication terminal.

(17) In the step where the interchangeable lens and the accessory communicate, the interchangeable lens information is transmitted to the accessory, and in the step where the camera and the accessory communicate, the accessory information is added to the interchangeable lens information received from the interchangeable lens. (16) The compatibility determination method of the camera system according to (16).

According to this aspect, in the step where the interchangeable lens and the accessory communicate, information about the interchangeable lens is transmitted to the accessory. The accessory adds its own information to the information on the interchangeable lens received from the interchangeable lens and transmits the information to the camera. Thereby, the information of an interchangeable lens and accessories can be acquired at once on the camera side.

(18) After acquiring the information on the accessory and the information on the interchangeable lens, the camera and the exchange are performed via the camera side extended communication terminal, the accessory side first extended communication terminal, the accessory side second extended communication terminal, and the lens side extended communication terminal. The compatibility determination method for a camera system according to (17), further including a step in which the lens communicates and the camera acquires information on the state of the interchangeable lens.

According to this aspect, after acquiring the information on the accessory and the information on the interchangeable lens, the camera includes the camera side extended communication terminal, the accessory side first extended communication terminal, the accessory side second extended communication terminal, and the lens side extended communication terminal. The information on the status of the interchangeable lens is acquired from the interchangeable lens. Thereby, the extended communication terminal can be effectively used even after acquiring information about the accessory and the interchangeable lens.

According to the present invention, the compatibility between the camera and the interchangeable lens can be determined easily and quickly.

System configuration diagram showing an example of an interchangeable lens camera system Front view of camera side mount Front view of lens side mount Block diagram showing the main electrical configuration of the camera Block diagram showing the electrical configuration of the power supply Block diagram showing an example of functions realized by the camera microcomputer Block diagram showing the main electrical configuration of the interchangeable lens Block diagram showing an example of functions realized by the lens microcomputer Diagram showing electrical connection between camera and interchangeable lens Block diagram of functions related to compatibility determination provided for cameras and interchangeable lenses A table showing the relationship between the output setting of the camera side communication terminal and the lens side communication terminal and the detected polarity according to the support status for a specific function System configuration diagram of second embodiment of interchangeable lens camera system The figure which shows the electrical constitution of the accessory Block diagram showing an example of functions realized by the accessory microcomputer The figure which shows the mutual electrical connection at the time of mounting accessories between a camera and an interchangeable lens

Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

◆◆ First embodiment ◆◆
[Camera system configuration]
The interchangeable lens camera system includes at least one camera and at least one interchangeable lens.

FIG. 1 is a system configuration diagram showing an example of an interchangeable lens camera system.

The camera system 1 shown in the figure includes a plurality of cameras 10 and a plurality of interchangeable lenses 100.

The plurality of cameras 10 are each composed of a digital camera. Each camera 10 has different specifications or functions. For example, the effective number of pixels of the image sensor, settable shooting sensitivity, settable metering method, settable exposure control method, shutter type, settable shutter speed, number of continuous shots, settable focus mode, settable White balance is different. Each camera 10 includes a common camera-side mount 14. Therefore, the same interchangeable lens 100 can be attached to each camera 10.

The plurality of interchangeable lenses 100 are composed of lenses having different specifications. For example, the focal length, the presence or absence of a camera shake correction function, and the like are different. Each interchangeable lens 100 includes a common lens side mount 104. The lens side mount 104 has a structure corresponding to the camera side mount 14. Therefore, each interchangeable lens 100 can be attached to any camera 10.

<Camera side mount>
FIG. 2 is a front view of the camera side mount.

Each camera 10 includes a camera-side mount 14 in the front portion of its camera body 12. The camera side mount 14 is a mounting portion for the interchangeable lens 100. The camera side mount 14 is configured by a known bayonet type mount. In FIG. 2, the direction indicated by the arrow R (clockwise direction) is the rotation direction of the interchangeable lens 100 when the interchangeable lens 100 is attached to the camera 10.

The camera side mount 14 is provided with a camera side terminal group CCG composed of a plurality of terminals CC1 to CC12. The plurality of terminals CC1 to CC12 constituting the camera side terminal group CCG are arranged at a constant interval on the circumference of one circle centered on the photographing optical axis. The functions of the terminals CC1 to CC12 will be described later.

<Lens side mount>
FIG. 3 is a front view of the lens side mount.

The interchangeable lens 100 includes a lens side mount 104 at the base end portion of the lens barrel 102. The lens side mount 104 is constituted by a bayonet type mount corresponding to the camera side mount 14 provided in the camera 10. In FIG. 3, the direction indicated by the arrow R (counterclockwise direction) is the rotation direction of the interchangeable lens 100 when the interchangeable lens 100 is mounted on the camera 10 (the lens-side mount 104 is mounted on the camera-side mount 14). The same as the rotation direction of the lens side mount 104 in this case.

The lens side mount 104 is provided with a lens side terminal group LCG composed of a plurality of terminals LC1 to LC12. The lens side terminal group LCG is provided corresponding to the camera side terminal group CCG. Accordingly, it is configured with the same number of terminals as the terminals constituting the camera side terminal group CCG, and the terminals LC1 to LC12 are arranged at the same intervals as the terminals CC1 to CC12 constituting the camera side terminal group CCG.

When the interchangeable lens 100 is attached to the camera 10, the terminals LC1 to LC12 of the lens side terminal group LCG are connected to the corresponding terminals CC1 to CC12 of the camera side terminal group CCG. That is, the first terminal LC1 of the lens side terminal group LCG is connected to the first terminal CC1 of the camera side terminal group CCG, and the second terminal LC2 of the lens side terminal group LCG is the second terminal CC1 of the camera side terminal group CCG. The twelfth terminal LC12 of the lens side terminal group LCG is connected to the twelfth terminal CC12 of the camera side terminal group CCG.

The functions of the terminals LC1 to LC12 constituting the lens side terminal group LCG will be described later.

<Electrical configuration of camera>
Here, an electrical main configuration provided in common for each camera 10 will be described.

FIG. 4 is a block diagram showing the main electrical configuration of the camera.

As shown in the figure, the camera 10 includes an image sensor 16, a shutter 18, an image sensor drive unit 20, a shutter drive unit 22, an analog signal processing unit 24, a display unit 26, an image data storage unit 28, a camera operation unit 30, A power supply unit 32 and a camera microcomputer 34 are provided.

<Image sensor>
The image sensor 16 converts an optical image of a subject formed through the interchangeable lens into an electrical signal and outputs the electrical signal. A known image sensor such as a CCD image sensor (CCD: Charged Coupled Device) or a CMOS image sensor (CMOS: Complementary Metal Oxide Semiconductor) is used for the image sensor 16.

<Image sensor driver>
The image sensor drive unit 20 includes a drive circuit for the image sensor 16. The image sensor driving unit 20 drives the image sensor 16 in response to an instruction from the camera microcomputer 34.

<shutter>
The shutter 18 is an optical path opening / closing device that adjusts the exposure time for the image sensor 16. The shutter 18 is constituted by, for example, a square-type focal plane shutter, and is disposed immediately before the image sensor 16.

<Shutter driver>
The shutter drive unit 22 includes a drive circuit that drives a charge motor, an electromagnet, and the like provided in the shutter 18. The shutter drive unit 22 drives a charge motor, an electromagnet, and the like according to an instruction from the camera microcomputer 34.

<Analog signal processor>
The analog signal processing unit 24 takes in an analog image signal output from the image sensor 16, performs predetermined signal processing (for example, correlated double sampling processing, amplification processing, etc.), and then converts it into a digital image signal. Output.

<Display section>
The display unit 26 includes a monitor and its drive circuit. The monitor is composed of, for example, an LCD (LCD: Liquid Crystal Display) and is provided on the back of the camera body.

<Image data storage unit>
The image data storage unit 28 is a storage unit for captured image data. The image data storage unit 28 includes a memory card and a socket for mounting the memory card. Reading and writing of image data to the memory card is controlled by the camera microcomputer 34.

<Camera operation section>
The camera operation unit 30 is an operation unit of the camera 10 and includes various operation buttons and a circuit that detects an operation of the operation buttons and outputs an operation signal to the camera microcomputer 34. The operation buttons provided on the camera 10 include a power button, a release button, and the like.

<Power supply part>
The power supply unit 32 generates and supplies power necessary for the operation of the camera 10 and the interchangeable lens 100 under the control of the camera microcomputer 34.

FIG. 5 is a block diagram showing the electrical configuration of the power supply unit.

As shown in the figure, the power supply unit 32 includes a battery 40, a power supply unit 42, and a lens driving power switch unit 44.

The battery 40 is a power source for the camera 10 and the interchangeable lens 100. The battery 40 is detachably loaded in a battery chamber (not shown) provided in the camera body.

The power supply unit 42 generates various power sources necessary for the operation of the camera 10 and the interchangeable lens 100 from the battery 40 under the control of the camera microcomputer 34 and supplies them to the respective units. The power supply unit 42 is constituted by, for example, a DC-DC converter (DC: Direct / Current).

In the camera 10 of the present embodiment, a plurality of lens driving power sources having different voltages are generated as power sources to be supplied to the interchangeable lens 100. In the camera 10 of the present embodiment, a first lens driving power supply LV1 having a voltage of + 5V, a second lens driving power supply LV2 having a voltage of + 6.5V, and a third lens driving power supply having a voltage of + 10V. Generate LV3.

As will be described later, the first lens driving power supply LV1 having the lowest voltage is supplied to the second terminal CC2 of the camera side terminal group CCG. The second lens driving power supply LV2 is supplied to the third terminal CC3 of the camera side terminal group CCG. The third lens driving power supply LV3 having the highest voltage is supplied to the fourth terminal CC4 of the camera side terminal group CCG.

The lens driving power switch unit 44 individually turns on and off the supply of the plurality of lens driving power sources LV1, LV2, and LV3 supplied from the power supply unit 42 in response to an instruction from the camera microcomputer 34. Thereby, the supply of the lens driving power supplies LV1, LV2, LV3 supplied from the power supply unit 42 to the plurality of terminals CC2, CC3, CC4 of the camera side terminal group CCG can be individually turned on / off.

<Camera microcomputer>
The camera microcomputer 34 is a control unit of the camera 10 that performs overall control of the operation of the camera 10. Camera microcomputer 34, CPU (CPU: Central Processing Unit), ROM (ROM: Read Only Memory), and RAM (RAM: Random Access Memory / memory capable of writing and reading data) ) And provide various functions by executing a prescribed program. In addition to various programs executed by the CPU, various data necessary for control are stored in the ROM.

FIG. 6 is a block diagram showing an example of functions realized by the camera microcomputer.

As shown in the figure, the camera microcomputer 34 executes a prescribed program, thereby performing a digital signal processing unit 50, a display control unit 52, a recording control unit 54, a power control unit 56, and a lens driving power switch control unit 58. , Function as a lens mounting detection unit 60, a camera communication unit 62, and the like.

The digital signal processing unit 50 takes in the digital image signal output from the analog signal processing unit 24 and performs predetermined signal processing to generate image data.

The display control unit 52 displays predetermined information on the monitor provided in the display unit 26. For example, when the playback mode is set, an image read from the memory card is displayed on the monitor. In addition, an image captured by the image sensor 16 when the shooting mode is set is displayed in real time. Furthermore, a setting screen is displayed on the monitor when performing various settings.

The recording control unit 54 reads / writes image data from / to the memory card mounted in the socket of the image data storage unit 28.

The power control unit 56 controls the power supply unit 42 to control the power supply to each unit.

The lens driving power switch control unit 58 controls the lens driving power switch unit 44 to control the supply of lens driving power. Specifically, the lens driving power supplies LV1 and LV2 supplied from the power supply unit 42 to a plurality of power terminals (second terminal CC2, third terminal CC3, and fourth terminal CC4) of the camera side terminal group CCG. , The supply of LV3 is individually turned on and off to control the supply of power for driving the lens. Thereby, the lens driving power can be selectively supplied.

The lens mounting detection unit 60 detects the mounting of the interchangeable lens 100. The lens mounting detection unit 60 detects the polarity of the lens detection port CP0 provided in the camera microcomputer input / output port 64 and determines whether or not the interchangeable lens 100 is mounted.

The camera communication unit 62 communicates with the interchangeable lens 100 attached to the camera 10. Communication is performed via the camera microcomputer input / output port 64. The camera microcomputer input / output port 64 is provided with a plurality of communication ports CP1 to CP7 for communicating with the interchangeable lens 100.

Here, the first communication port CP1 is a communication port for notifying the camera 10 of the state from the interchangeable lens 100. In particular, in the camera system 1 of the present embodiment, the first communication port CP1 is used as a port for notifying that a predetermined function of the interchangeable lens 100 is operating. For example, it is used as a port for notifying that the aperture motor is operating.

The second communication port CP2 is a communication port for transmitting a VSYNC signal (VSYNC: Vertical SYNChronizing / vertical synchronization signal) from the camera 10 to the interchangeable lens 100.

The third communication port CP3, the fourth communication port CP4, and the fifth communication port CP5 are synchronized with the interchangeable lens 100 by three lines (hereinafter referred to as three-wire serial communication). ) For communication. Specifically, it is a communication port that constitutes an SPI (SPI: Serial Peripheral Interface) that is a synchronous serial communication interface.

The third communication port CP3 is a communication port (MOSI port (MOSI: Master-Out-Slave-In)) for transmitting a signal from the camera 10 as the SPI master to the interchangeable lens 100 as the SPI slave.

The fourth communication port CP4 is a communication port (SCK port (SCK: Serial ClocK)) for transmitting a synchronization clock signal from the camera 10 as the SPI master to the interchangeable lens 100 as the SPI slave. is there.

Further, the fifth communication port CP5 is a communication port (MISO port (MISO: Master-In-Slave-Out)) for transmitting a signal from the interchangeable lens 100 as the SPI slave to the camera 10 as the SPI master. The fifth communication port CP5 is configured to be capable of open drain output. This point will be described later.

The sixth communication port CP6 is also a communication port for performing serial communication with the interchangeable lens 100, and is a communication port for performing unidirectional serial communication. More specifically, it is a communication port for performing asynchronous serial communication (hereinafter referred to as single-wire serial communication) using a single line, and is a communication port that constitutes a UART (Universal Asynchronous Receiver Receiver Transmitter). In particular, in the camera system 1 of the present embodiment, the sixth communication port CP6 functions as an RXD port (RXD: Received eXchange Data) and receives a signal transmitted from the interchangeable lens 100. Used as a communication port.

The seventh communication port CP7 is a communication port for notifying the camera 10 of the state from the interchangeable lens 100.

When the camera communication unit 62 performs three-wire serial communication with the interchangeable lens 100 using the third communication port CP3, the fourth communication port CP4, and the fifth communication port CP5, Make the necessary settings to establish the communication. That is, the camera communication unit 62 also functions as a camera side communication setting unit.

The communication with the interchangeable lens 100 and the electrical connection with the interchangeable lens 100 via the mount will be described in detail later.

Note that the above is a description of the basic configuration of a digital camera, and each camera can further have individual functions.

<Electrical configuration of interchangeable lens>
Here, an electrical main configuration provided in common to each interchangeable lens 100 will be described.

FIG. 7 is a block diagram showing an electrical main configuration of the interchangeable lens. The figure shows the electrical configuration of an interchangeable lens having an AF mechanism (AF: Auto / Focus) and an aperture.

As shown in the figure, the interchangeable lens 100 includes a lens driving unit 110, a lens-side system power generation unit 112, and a lens microcomputer 114.

<Lens drive unit>
The lens driving unit 110 drives an optical member constituting the interchangeable lens 100 in accordance with an instruction from the lens microcomputer 114.

As described above, the interchangeable lens 100 shown in FIG. 7 has an AF function and a diaphragm. For this reason, the interchangeable lens 100 of this example includes a focus driving unit 110A and a diaphragm driving unit 110C as the lens driving unit 110.

The focus driving unit 110A drives a focus lens 106A that is an optical member for focusing. The focus drive unit 110A includes a focus motor (for example, an ultrasonic motor) for driving the focus lens, and a drive circuit thereof. The focus drive unit 110A drives the focus motor in response to an instruction from the lens microcomputer 114 to operate the focus lens 106A.

The aperture driving unit 110C drives an aperture that is an optical member for adjusting the amount of light. The aperture drive unit 110C includes an aperture motor for driving the aperture 106C and a drive circuit thereof. The aperture driving unit 110C drives the aperture motor in response to an instruction from the lens microcomputer 114 to operate the aperture 106C.

As will be described later, the lens driving unit 110 includes a plurality of lens driving power supplies LV1 (+ 5V), LV2 (+ 6.5V) having different voltages from a plurality of terminals LC2 to LC4 (power supply terminals) of the lens side terminal group LCG. LV3 (+ 10V) is supplied. Any one of the plurality of lens driving power supplies LV1, LV2, and LV3 supplied to each driving unit of the lens driving unit 110 is supplied. For example, the third lens driving power source LV3 having the highest voltage is supplied to the focus driving unit 110A, and the first lens driving power source LV1 having the lowest voltage is supplied to the aperture driving unit 110C.

<Lens side system power generator>
The lens side system power generation unit 112 generates a system power for operating the lens microcomputer 114. The lens-side system power generation unit 112 uses the lens driving power supplied from the camera 10 to generate a system power.

Here, the lens microcomputer 114 is configured to operate at a voltage lower than that of each driving unit included in the lens driving unit 110. For example, it is configured to operate at + 3.3V.

The lens-side system power supply generation unit 112 uses the lowest lens drive power supply LV1 (+ 5V) among the plurality of lens drive power supplies LV1 to LV3 supplied from the camera 10 to generate a system power supply (+ 3.3V). It is generated and supplied to the lens microcomputer 114. At this time, the lens-side system power supply generation unit 112 generates a system power supply by a voltage drop due to resistance. Thereby, it is possible to prevent the occurrence of noise accompanying the generation of the system power supply.

An LDO regulator can be exemplified as a device that generates a system power supply by a voltage drop due to resistance. The LDO regulator is one of linear regulators, and converts it into a desired output voltage by consuming input power by using on-resistance of switching elements such as a power MOSFET and a power transistor.

<Lens microcomputer>
The lens microcomputer 114 is a control unit of the interchangeable lens 100 that performs overall control of the operation of the interchangeable lens 100. The lens microcomputer 114 controls the operation of the interchangeable lens 100 based on an instruction from the camera microcomputer 34.

The lens microcomputer 114 includes a CPU, a ROM, and a RAM, and provides various functions by executing a prescribed program. In addition to various programs executed by the CPU, various data necessary for control are stored in the ROM.

FIG. 8 is a block diagram showing an example of functions realized by the lens microcomputer.

As shown in the figure, the lens microcomputer 114 functions as a focus drive control unit 120, an aperture drive control unit 124, a lens communication unit 126, and the like by executing a prescribed program.

The focus drive control unit 120 controls the focus drive unit 110A and operates the focus lens 106A in accordance with an instruction from the camera microcomputer 34.

The aperture drive control unit 124 controls the aperture drive unit 110C and operates the aperture 106C in response to an instruction from the camera microcomputer 34.

The lens communication unit 126 communicates with the camera 10 to which the interchangeable lens 100 is attached. Communication is performed via the lens microcomputer input / output port 128. The lens microcomputer input / output port 128 includes a plurality of communication ports LP1 to LP7 for communicating with the interchangeable lens 100. The communication ports LP1 to LP7 are provided corresponding to the plurality of communication ports CP1 to CP7 provided in the camera microcomputer input / output port 64 of the camera microcomputer 34.

Therefore, the first communication port LP1 is used for notification of the state of the camera 10, and the second communication port LP2 is used for receiving a VSYNC signal transmitted from the camera 10.

Further, the third communication port LP3, the fourth communication port LP4, and the fifth communication port LP5 are used for three-wire serial communication with the camera 10. The fifth communication port LP5 is configured to be capable of open drain output. This point will be described later.

The sixth communication port LP6 is a communication port for performing single-line serial communication with the camera 10, and is a communication port constituting the UART. In particular, in the camera system 1 of the present embodiment, the sixth communication port LP6 is used as a TXD port (TXD: TransmitTranseXchange Data / data transmission). That is, it is used as a communication port for transmitting a signal to the camera 10.

Further, the seventh communication port LP7 is used for notification of a state to the camera 10.

The communication with the camera 10 and the electrical connection with the camera 10 via the mount will be described in detail later.

When the lens communication unit 126 performs three-wire serial communication with the camera 10 using the third communication port LP3, the fourth communication port LP4, and the fifth communication port LP5, Make the settings necessary to establish communication. That is, the lens communication unit 126 also functions as a lens side communication setting unit.

The interchangeable lens 100 can include, for example, a camera shake correction mechanism in addition to the above basic configuration.

<Electric connection between camera and interchangeable lens>
FIG. 9 is a diagram illustrating an electrical connection between the camera and the interchangeable lens.

As shown in the figure, the camera 10 and the interchangeable lens 100 are electrically connected via a camera side terminal group CCG provided in the camera side mount 14 and a lens side terminal group LCG provided in the lens side mount 104. Is done.

In FIG. 9, the direction indicated by the arrow R is the rotation direction of the interchangeable lens 100 when the interchangeable lens 100 is attached to the camera 10. Therefore, when the interchangeable lens 100 is attached to the camera 10, the lens side terminal group LCG moves in the direction indicated by the arrow R in FIG. 9 with respect to the camera side terminal group CCG.

<Camera side terminal group>
The camera side terminal group CCG is composed of 12 terminals CC1 to CC12. Each of the terminals CC1 to CC12 has the same shape and is arranged at a constant interval on the same circumference.

(A) First terminal CC1
The first terminal CC1 is a lens detection terminal for detecting the mounting of the interchangeable lens 100. The first terminal CC1 is connected to the lens detection port CP0 of the camera microcomputer 34. The first terminal CC1 is connected to the power supply unit 42 (see FIG. 5) via the pull-up resistor CR1 and pulled up to a predetermined potential (for example, +3.3 V).

(B) Second terminal CC2 to fourth terminal CC4
The second terminal CC2, the third terminal CC3, and the fourth terminal CC4 are a plurality of power supply terminals for supplying a plurality of lens driving power supplies LV1, LV2, and LV3 to the interchangeable lens 100.

Here, the second terminal CC2 is a first power supply terminal for supplying the first lens driving power supply LV1 to the interchangeable lens. The second terminal CC2 is connected to the power supply unit 42 via the lens driving power switch unit 44 (see FIG. 5). The first lens driving power supply LV1 having the lowest voltage is supplied from the power supply section 42 to the second terminal CC2. The lens driving power switch unit 44 turns on and off the supply of the first lens driving power supply LV1 to the second terminal CC2 in response to an instruction from the camera microcomputer 34.

The third terminal CC3 is a second power supply terminal for supplying the second lens driving power supply LV2 to the interchangeable lens. The third terminal CC3 is connected to the power supply unit 42 via the lens driving power switch unit 44 (see FIG. 5). A second lens driving power supply LV2 is supplied from the power supply unit 42 to the third terminal CC3. The lens driving power switch 44 turns on / off the supply of the second lens driving power LV2 to the third terminal CC3 in response to an instruction from the camera microcomputer 34.

The fourth terminal CC4 is a third power supply terminal for supplying the third lens driving power supply LV3 to the interchangeable lens. The fourth terminal CC4 is connected to the power supply unit 42 via the lens driving power switch unit 44 (see FIG. 5). The fourth lens CC4 is supplied with the third lens driving power supply LV3 having the highest voltage from the power supply unit. The lens driving power switch unit 44 turns on / off the supply of the third lens driving power supply LV3 to the fourth terminal CC4 in response to an instruction from the camera microcomputer 34.

(C) Fifth terminal CC5 and sixth terminal CC6
The fifth terminal CC5 and the sixth terminal CC6 are ground terminals, and are both grounded.

(D) Seventh terminal CC7 to twelfth terminal CC12
The seventh terminal CC7 to the twelfth terminal CC12 are communication terminals for communicating with the interchangeable lens 100.

Here, the seventh terminal CC7 is a communication terminal for notifying the camera 10 of the state from the interchangeable lens 100. The seventh terminal CC7 is connected to the first communication port CP1 of the camera microcomputer 34. As described above, the first communication port CP1 of the camera microcomputer 34 is used to notify that a predetermined function of the interchangeable lens 100 is in operation.

The eighth terminal CC8 is a communication terminal for transmitting a VSYNC signal from the camera 10 to the interchangeable lens 100. The eighth terminal CC8 is connected to the second communication port CP2 of the camera microcomputer 34.

The ninth terminal CC9, the tenth terminal CC10, and the eleventh terminal CC11 are communication terminals for performing three-wire serial communication with the interchangeable lens 100, respectively. The ninth terminal CC9 is connected to the third communication port CP3 (MOSI port) of the camera microcomputer 34. The tenth terminal CC10 is connected to the fourth communication port CP4 (SCK port) of the camera microcomputer 34. The eleventh terminal CC11 is connected to the fifth communication port CP5 (MISO port) of the camera microcomputer 34.

Here, as described above, the fifth communication port CP5 of the camera microcomputer 34 is configured by a port capable of open drain output. Therefore, the eleventh terminal CC11 connected to the fifth communication port CP5 (MISO port) of the camera microcomputer 34 is configured as a terminal capable of open drain output. The eleventh terminal CC11 is an example of a camera-side communication terminal. Based on the polarity of the eleventh terminal CC11, it is determined whether or not the interchangeable lens 100 attached to the camera 10 corresponds to a specific function. Is done. This will be described in detail later.

Also, the ninth terminal CC9, the tenth terminal CC10, and the eleventh terminal CC11 are examples of a plurality of terminals used when the camera 10 and the interchangeable lens 100 perform serial communication.

The twelfth terminal CC12 is an example of a camera side extended communication terminal. The twelfth terminal CC12 is a terminal for performing single-wire serial communication with the interchangeable lens 100, and the twelfth terminal CC12 is a terminal for notifying the camera 10 of the state from the interchangeable lens 100. is there. The twelfth terminal CC12 is connected to the sixth communication port CP6 and the seventh communication port CP7 of the camera microcomputer 34.

The plurality of terminals CC1 to CC12 constituting the camera side terminal group CCG are the first terminal CC1, the second terminal CC2, and the rotation direction R of the interchangeable lens 100 when the interchangeable lens 100 is attached to the camera 10. ..., the eleventh terminal CC11 and the twelfth terminal CC12 are arranged in this order. Accordingly, the camera-side terminal group CCG includes a lens detection terminal (first terminal CC1), a plurality of power supply terminals (second terminal CC2 to fourth terminal CC4), and a plurality of ground terminals (fifth terminal CC5 and fifth terminal CC5). 6 terminals CC6) and a plurality of communication terminals (seventh terminal CC7 to twelfth terminal CC12).

<Lens side terminal group>
The lens side terminal group LCG corresponds to the camera side terminal group CCG. Accordingly, it is configured with the same number of terminals as the terminals constituting the camera side terminal group CCG, and the terminals LC1 to LC12 are arranged at the same intervals as the terminals CC1 to CC12 constituting the camera side terminal group CCG.

(A) First terminal LC1
The first terminal LC1 is a lens detection terminal corresponding to the lens detection terminal (first terminal CC1) on the camera side. Therefore, when the interchangeable lens 100 is attached to the camera 10, the first terminal LC1 is connected to the first terminal CC1 on the camera side. The first terminal LC1 is grounded via the pull-down resistor LR1, and is pulled down to the ground potential.

(B) Second terminal LC2, third terminal LC3, and fourth terminal LC4
The second terminal LC2, the third terminal LC3, and the fourth terminal LC4 are a plurality of power supply terminals (second terminal CC2, third terminal CC3, and fourth terminal CC4) on the camera side. Power supply terminal. Therefore, when the interchangeable lens 100 is attached to the camera 10, the second terminal LC2 is connected to the second terminal CC2 on the camera side, and the third terminal LC3 is connected to the third terminal CC3 on the camera side. . The fourth terminal LC4 is connected to the camera-side fourth terminal CC4.

As described above, the second terminal CC2 on the camera side is a first power supply terminal for supplying the first lens driving power supply LV1 (+5 V) having the lowest voltage. Therefore, when the interchangeable lens 100 is attached to the camera 10, the first lens driving power supply LV1 having the lowest voltage is supplied to the second terminal LC2.

The lens side system power generation unit 112 is connected to the second terminal LC2 in the interchangeable lens. The lens-side system power supply generation unit 112 generates a system power supply (+3.3 V) using the first lens driving power supply LV1 (+5 V) supplied from the second terminal LC2, and supplies the system power supply to the lens microcomputer 114. To do.

The third terminal CC3 on the camera side is a second power supply terminal for supplying a second lens driving power supply LV2 (+6.5 V). Therefore, when the interchangeable lens 100 is attached to the camera 10, the second lens driving power supply LV2 is supplied to the third terminal LC3.

The fourth terminal CC4 on the camera side is a third power supply terminal for supplying the lens driving power supply LV3 (+ 10V) having the highest voltage. Therefore, when the interchangeable lens 100 is attached to the camera 10, the third lens driving power supply LV3 having the highest voltage is supplied to the fourth terminal CC4 on the camera side.

(C) Fifth terminal LC5 and sixth terminal LC6
The fifth terminal LC5 and the sixth terminal LC6 are two ground terminals corresponding to two ground terminals (fifth terminal CC5 and sixth terminal CC6) on the camera side, respectively. Therefore, when the interchangeable lens 100 is attached to the camera 10, the fifth terminal LC5 is connected to the fifth terminal CC5 on the camera side, and the sixth terminal LC6 is connected to the sixth terminal CC6 on the camera side.

(D) Seventh terminal LC7 to twelfth terminal LC12
The seventh terminal LC7 to the twelfth terminal LC12 are a plurality of communication terminals corresponding to the plurality of communication terminals on the camera side (seventh terminal CC7 to twelfth terminal CC12). Therefore, when the interchangeable lens 100 is attached to the camera 10, the seventh terminal LC7 is connected to the camera-side seventh terminal CC7, and the eighth terminal LC8 is connected to the camera-side eighth terminal CC8. The ninth terminal LC9 is connected to the camera-side ninth terminal CC9, and the tenth terminal LC10 is connected to the camera-side tenth terminal CC10. Further, the eleventh terminal LC11 is connected to the eleventh terminal CC11 on the camera side, and the twelfth terminal LC12 is connected to the twelfth terminal CC12 on the camera side.

As described above, the seventh terminal CC7 on the camera side is a communication terminal for notifying the camera 10 of the state from the interchangeable lens 100. Accordingly, the seventh terminal LC7 is also used as a communication terminal for notifying the camera 10 of the state from the interchangeable lens 100. The seventh terminal LC7 is connected to the first communication port LP1 of the lens microcomputer 114.

The camera-side eighth terminal CC8 is a communication terminal for transmitting a VSYNC signal from the camera 10 to the interchangeable lens 100. Therefore, the eighth terminal LC8 is used as a communication terminal for receiving the VSYNC signal transmitted from the camera side. The eighth terminal LC8 is connected to the second communication port LP2 of the lens microcomputer 114.

The camera-side ninth terminal CC9, tenth terminal CC10, and eleventh terminal CC11 are communication terminals for performing three-wire serial communication with the interchangeable lens 100, respectively. Accordingly, the ninth terminal LC9, the tenth terminal LC10, and the eleventh terminal LC11 are also used as communication terminals for performing three-wire serial communication with the camera 10. The ninth terminal LC9 is connected to the third communication port LP3 of the lens microcomputer 114. The tenth terminal LC10 is connected to the fourth communication port LP4 of the lens microcomputer 114. The eleventh terminal LC11 is connected to the fifth communication port LP5 of the lens microcomputer 114.

Here, as described above, the fifth communication port LP5 of the lens microcomputer 114 is configured by a port capable of open drain output. Therefore, the eleventh terminal LC11 connected to the fifth communication port LP5 (MISO port) of the lens microcomputer 114 is configured as a terminal capable of open drain output. The eleventh terminal LC11 is an example of a lens side communication terminal, and based on the polarity of the eleventh terminal LC11, it is determined whether or not the attached camera 10 is compatible with a specific function. This will be described in detail later.

Further, the ninth terminal LC9, the tenth terminal LC10, and the eleventh terminal LC11 are examples of a plurality of terminals used when the camera 10 and the interchangeable lens 100 perform serial communication.

The camera-side twelfth terminal CC12 is a terminal for performing single-wire serial communication with the interchangeable lens 100, and is a terminal for notifying the camera 10 of the state from the interchangeable lens 100. Accordingly, the twelfth terminal LC12 also functions as a terminal for performing single-wire serial communication with the camera 10 and a terminal for notifying the camera 10 of the state. The twelfth terminal LC12 is connected to the sixth communication port LP6 and the seventh communication port LP7 of the lens microcomputer 114. The twelfth terminal LC12 is an example of a lens side extended communication terminal.

As shown in FIG. 9, among the plurality of terminals (seventh terminal LC7 to twelfth terminal LC12) constituting the communication terminal, the seventh terminal LC7, the eighth terminal LC8 and the twelfth terminal LC12 are Are connected to the lens-side system power generation unit 112 via the pull-up resistors LR7, LR8, and LR12, respectively, and are pulled up to the potential of the system power supply (for example, +3.3 V) supplied from the lens-side system power generation unit 112. The

Also, the ninth terminal LC9 among the plurality of terminals (seventh terminal LC7 to twelfth terminal LC12) constituting the communication terminal is grounded via the pull-down resistor LR9 and pulled down to the ground potential.

The plurality of terminals LC1 to LC12 constituting the lens side terminal group LCG are also arranged in the same arrangement as the plurality of terminals CC1 to CC12 constituting the camera side terminal group CCG. That is, the first terminal LC1, the second terminal LC2,..., The eleventh terminal LC11, and the twelfth terminal LC12 with respect to the rotation direction R of the interchangeable lens 100 when the interchangeable lens 100 is attached to the camera 10. Arranged in order. Therefore, the lens side terminal group LCG also includes a lens detection terminal (first terminal LC1), a plurality of power supply terminals (second terminal LC2 to fourth terminal LC4), and a plurality of ground terminals (fifth terminal LC5 and sixth terminal LC5). Terminal LC6) and a plurality of communication terminals (seventh terminal LC7 to twelfth terminal LC12) in this order.

<Functions related to compatibility determination>
FIG. 10 is a block diagram of functions related to compatibility determination provided in the camera and the interchangeable lens.

<Compatibility judgment function provided on the camera>
As described above, in the camera 10, the eleventh terminal CC11 functions as a camera-side communication terminal, and the interchangeable lens 100 attached to the camera 10 has a specific function based on the polarity of the eleventh terminal CC11. It is determined whether or not

Note that the function to be determined is determined in advance. As an example, in the camera system 1 of the present embodiment, the camera side extended communication terminal (the twelfth terminal CC12) and the lens side extended communication terminal (the twelfth terminal LC12) are used to connect the camera 10 to the camera 10. A function for transmitting lens information is determined. When both the camera 10 and the interchangeable lens 100 are compatible with the function, the interchangeable lens is used by using the camera side extended communication terminal (the twelfth terminal CC12) and the lens side extended communication terminal (the twelfth terminal LC12). Lens information is transmitted from 100 to the camera 10 by single-wire serial communication. The camera 10 receives the transmitted lens information and acquires the lens information of the attached interchangeable lens 100. This will be described in detail later.

The eleventh terminal CC11 is connected to the fifth communication port CP5 (MISO port) of the camera microcomputer 34. As described above, the fifth communication port CP5 is a port capable of open drain output.

The camera microcomputer 34 has a function of setting the polarity of the fifth communication port CP5 to the HIGH level that is the first polarity or the LOW level that is the second polarity. This function is provided by the camera side communication terminal polarity setting unit 70. The camera microcomputer 34 functions as the camera side communication terminal polarity setting unit 70 by executing a predetermined program. When the camera 10 supports a specific function, the camera side communication terminal polarity setting unit 70 sets the polarity of the fifth communication port CP5 to the HIGH level that is the first polarity. On the other hand, when the camera 10 does not support a specific function, the polarity of the fifth communication port CP5 is set to the LOW level that is the second polarity.

When the fifth communication port CP5 of the camera microcomputer 34 is set to HIGH level (first polarity), the eleventh terminal CC11 is set to HIGH level (first polarity). Further, when the fifth communication port CP5 of the camera microcomputer 34 is set to the LOW level (second polarity), the eleventh terminal CC11 is set to the LOW level (second polarity).

The camera microcomputer 34 detects the polarity of the fifth communication port CP5, and determines whether or not the interchangeable lens 100 attached to the camera 10 corresponds to a specific function based on the detected polarity. It has a function. This function is provided by the camera side determination unit 72. The camera microcomputer 34 functions as the camera side determination unit 72 by executing a predetermined program. The camera side determination unit 72 detects the polarity of the fifth communication port CP5, and the interchangeable lens 100 attached to the camera 10 has a specific function only when the detected polarity is HIGH level (first polarity). Judge that it corresponds.

Note that the fifth communication port CP5 of the camera microcomputer 34 is set to the HIGH level (first polarity) by setting the eleventh terminal CC11 to the HIGH level (first polarity). Further, by setting the eleventh terminal CC11 to the LOW level (second polarity), the fifth communication port CP5 of the camera microcomputer 34 is set to the LOW level (second polarity).

<Compatibility determination function provided on the interchangeable lens side>
As described above, in the interchangeable lens 100, the eleventh terminal LC11 functions as a lens-side communication terminal, and the camera 10 as the mounting destination corresponds to a specific function based on the polarity of the eleventh terminal LC11. It is determined whether or not.

The eleventh terminal LC11 is connected to the fifth communication port LP5 (MISO port) of the lens microcomputer 114. As described above, the fifth communication port LP5 is a port capable of open drain output.

The lens microcomputer 114 has a function of setting the polarity of the fifth communication port LP5 to the HIGH level that is the first polarity or the LOW level that is the second polarity. This function is provided by the lens side communication terminal polarity setting unit 130. The lens microcomputer 114 functions as the lens-side communication terminal polarity setting unit 130 by executing a predetermined program. When the interchangeable lens 100 supports a specific function, the lens side communication terminal polarity setting unit 130 sets the polarity of the fifth communication port LP5 to the HIGH level that is the first polarity. On the other hand, when the interchangeable lens 100 does not support a specific function, the polarity of the fifth communication port LP5 is set to the LOW level that is the second polarity.

When the fifth communication port LP5 of the lens microcomputer 114 is set to HIGH level (first polarity), the eleventh terminal LC11 is set to HIGH level (first polarity). Further, when the fifth communication port LP5 of the lens microcomputer 114 is set to the LOW level (second polarity), the eleventh terminal LC11 is set to the LOW level (second polarity).

In addition, the lens microcomputer 114 has a function of detecting the polarity of the fifth communication port LP5 and determining whether or not the attached camera 10 is compatible with a specific function based on the detected polarity. This function is provided by the lens side determination unit 132. The lens microcomputer 114 functions as the lens side determination unit 132 by executing a predetermined program. The lens-side determination unit 132 detects the polarity of the fifth communication port LP5, and only when the detected polarity is the HIGH level (first polarity), the camera 10 as the attachment destination corresponds to a specific function. Is determined.

The eleventh terminal LC11 is set to the HIGH level (first polarity), so that the fifth communication port LP5 of the lens microcomputer 114 is set to the HIGH level (first polarity). Further, when the eleventh terminal LC11 is set to the LOW level (second polarity), the fifth communication port LP5 of the lens microcomputer 114 is set to the LOW level (second polarity).

<Polarity of camera side communication terminal and lens side communication terminal>
When the interchangeable lens 100 is attached to the camera 10, an eleventh terminal CC11 on the camera side that is a camera side communication terminal and an eleventh terminal LC11 on the interchangeable lens side that is a lens side communication terminal are connected. As a result, the fifth communication port CP5 of the camera microcomputer 34 and the fifth communication port LP5 of the lens microcomputer 114 are connected.

Here, as described above, the fifth communication port CP5 of the camera microcomputer 34 and the fifth communication port LP5 of the lens microcomputer 114 are capable of open drain output, and are each at a HIGH level (first polarity) or When set to the LOW level (second polarity), the polarity is set as follows. That is, both are set to HIGH level (first polarity) only when both are set to HIGH level (first polarity), and both are set to LOW when at least one is set to LOW level (second polarity). Level (second polarity). Therefore, if the polarities of the fifth communication port CP5 of the camera microcomputer 34 and the fifth communication port LP5 of the lens microcomputer 114 after the output setting are detected, both the camera 10 and the interchangeable lens 100 correspond to a specific function. It can be determined whether or not compatibility is achieved.

The camera side determination unit 72 detects the polarity of the fifth communication port CP5 after the output setting (= the polarity of the eleventh terminal CC11), and only when the detected polarity is the HIGH level (first polarity). It is determined that the attached interchangeable lens 100 corresponds to a specific function. That is, it is determined that the interchangeable lens 100 is compatible.

Similarly, the lens side determination unit 132 detects the polarity of the fifth communication port LP5 (= the polarity of the eleventh terminal LC11) after the output setting, and only when the detected HIGH level (first polarity) is detected. It determines with the camera 10 of a mounting destination corresponding to a specific function. That is, it is determined that the camera 10 is compatible.

FIG. 11 is a table showing the relationship between the output settings of the camera side communication terminal and the lens side communication terminal and the detected polarity in accordance with the corresponding status of a specific function.

As shown in the figure, when the camera 10 and the interchangeable lens 100 correspond to a specific function, the camera side communication terminal (eleventh terminal CC11) and the lens side communication terminal (eleventh terminal LC11) are connected. The output setting is set to HIGH level (first polarity). On the other hand, if the specific function is not supported, the output settings of the camera side communication terminal (11th terminal CC11) and the lens side communication terminal (11th terminal LC11) are set to the LOW level (second polarity). The

Further, both the camera side communication terminal (11th terminal CC11) and the lens side communication terminal (11th terminal LC11) after the output setting are both set to HIGH level (first polarity). When the level is HIGH (first polarity) and at least one is set to LOW level (second polarity), both are LOW level (second polarity).

As described above, in the camera system 1 according to the present embodiment, whether or not the camera 10 and the interchangeable lens 100 are compatible can be determined by detecting the polarities of the camera side communication terminal and the lens side communication terminal.

[Operation of camera system]
<Attaching an interchangeable lens>
The interchangeable lens 100 is attached to the camera 10 by attaching the lens side mount 104 provided in the interchangeable lens 100 to the camera side mount 14 provided in the camera 10. At this time, the interchangeable lens 100 is rotated and attached to the camera 10.

By attaching the interchangeable lens 100 to the camera 10, the lens side terminal group LCG provided in the lens side mount 104 is connected to the camera side terminal group CCG provided in the camera side mount 14.

When the interchangeable lens 100 is attached to the camera 10, the lens side terminal group LCG includes a lens detection terminal (first terminal LC1) and a plurality of power supply terminals (second terminal LC2 to fourth terminal LC4) along the rotation direction. ), A plurality of ground terminals (fifth terminal LC5 and sixth terminal LC6), and a plurality of communication terminals (seventh terminal LC7 to twelfth terminal LC12) are arranged in this order. More terminals LC2 to LC4) can be brought into contact with the terminals of the camera side terminal group CCG. Thereby, the self-cleaning effect of the plurality of power supply terminals (second terminal LC2 to fourth terminal LC4) of the lens side terminal group LCG can be improved. As a result, the contact resistance of the plurality of power supply terminals (second terminal LC2 to fourth terminal LC4) of the lens side terminal group LCG can be reduced, and power can be supplied efficiently.

<Detection of attached interchangeable lens>
The camera microcomputer 34 detects whether or not the interchangeable lens 100 is attached based on the polarity of the first terminal (lens detection terminal) CC1 of the camera side terminal group CCG.

When the interchangeable lens 100 is not attached, the first terminal CC1 on the camera side is pulled up by the pull-up resistor CR1, and as a result, becomes a HIGH level (high potential).

On the other hand, when the interchangeable lens 100 is attached to the camera 10, as shown in FIG. 9, the first terminal CC1 on the interchangeable lens side (lens detection terminal) LC1 is connected to the first terminal CC1 on the camera side. . Since the first terminal LC1 on the interchangeable lens side is grounded, when the first terminal LC1 on the interchangeable lens side is connected to the first terminal CC1 on the camera side, the first terminal CC1 on the camera side. Becomes LOW level (low potential).

The camera microcomputer 34 detects whether or not the interchangeable lens 100 is attached based on the polarity (HIGH level or LOW level) of the lens detection port CP0 connected to the first terminal CC1 on the camera side. That is, when the potential of the lens detection port CP0 is HIGH level, it is determined that the interchangeable lens 100 is not attached. When the potential of the lens detection port CP0 is LOW level, the interchangeable lens 100 is attached. It is determined that the interchangeable lens 100 is attached.

It should be noted that the first terminal CC1, which is a lens detection terminal, is arranged at the head in the rotation direction R of the interchangeable lens 100 when the interchangeable lens 100 is attached to the camera 10. Thereby, when the interchangeable lens 100 is attached or detached, it is possible to prevent the terminals other than the first terminal LC1 on the interchangeable lens side from coming into contact with the first terminal CC1 on the camera side. Thereby, erroneous detection can be prevented.

<Starting the lens microcomputer>
When the camera microcomputer 34 detects that the interchangeable lens 100 is attached, the camera microcomputer 34 causes the power supply unit 42 to start supplying the lens driving power. That is, the power supply unit 42 and the lens driving power supplies LV1, LV2, and LV3 are supplied to a plurality of power supply terminals (second terminal CC2, third terminal CC3, and fourth terminal CC4) on the camera side. The lens driving power switch 44 is controlled. Accordingly, the lens driving power supplies LV1, LV2, and LV3 are supplied to the plurality of power supply terminals (second terminal CC2, third terminal CC3, and fourth terminal CC4) on the camera side, respectively.

Further, when lens driving power supplies LV1, LV2, and LV3 are supplied to a plurality of power supply terminals (second terminal CC2, third terminal CC3, and fourth terminal CC4) on the camera side, a plurality of camera side power supplies are supplied. A plurality of power supply terminals (second terminal LC2, third terminal LC3, and fourth terminal) on the interchangeable lens side connected to power supply terminals (second terminal CC2, third terminal CC3, and fourth terminal CC4). The lens driving power supplies LV1, LV2, and LV3 are supplied to the interchangeable lens 100 via LC4).

When the lens driving power supplies LV1, LV2, and LV3 are supplied to the interchangeable lens 100, a system power supply for the lens microcomputer 114 is generated using one of them. The system power supply of the lens microcomputer 114 is generated by the lens side system power generation unit 112. The lens-side system power supply generation unit 112 uses the first lens drive power supply LV1 (+ 5V) having the lowest voltage among the plurality of lens drive power supplies LV1, LV2, and LV3 supplied from the camera side, and uses the system power supply. (+3.3 V) is generated and supplied to the lens microcomputer 114.

When the system power is normally supplied to the lens microcomputer 114, the lens microcomputer 114 is activated.

<Detection of normal system power supply to the lens microcomputer>
The camera microcomputer 34 detects that the system power is normally supplied to the lens microcomputer 114 based on the polarity of a specific terminal of the camera side terminal group CCG. The specific terminal here is a terminal connected to a terminal to which a pull-up resistor is connected on the interchangeable lens side.

On the interchangeable lens side, the terminals to which the pull-up resistors LR7, LR8, LR12 are connected are the seventh terminal LC7, the eighth terminal LC8, and the twelfth terminal LC12. The camera-side terminals connected to these terminals are the seventh terminal CC7, the eighth terminal CC8, and the twelfth terminal CC12.

The camera microcomputer 34 includes a first communication port CP1 connected to the seventh terminal CC7 of the camera side terminal group CCG, and a second communication port CP2 connected to the eighth terminal CC8 of the camera side terminal group CCG. And the polarity (HIGH level or LOW level) of the sixth communication port CP6 connected to the twelfth terminal CC12 of the camera side terminal group CCG is discriminated, and the system power is normally supplied to the lens microcomputer 114. Detect that. Specifically, when it is detected that the polarities of the first communication port CP1, the second communication port CP2, and the sixth communication port CP6 are HIGH levels, the system power is normally supplied to the lens microcomputer 114. It is determined that Thus, even when the system power supply of the lens microcomputer 114 is generated on the interchangeable lens side, it can be properly detected on the camera side that the system power supply is normally supplied to the lens microcomputer 114. In particular, as in the camera system 1 of the present embodiment, it is possible to detect more accurately by determining the polarities of a plurality of terminals.

When the system power is normally supplied to the lens microcomputer 114 and the lens microcomputer 114 starts up normally, the lens microcomputer 114 switches the polarity of the first communication port LP1 to the LOW level. As a result, the polarities of the seventh terminal LC7 on the interchangeable lens side and the seventh terminal CC7 on the camera side are switched from HIGH level to LOW level. The camera microcomputer 34 detects that the seventh terminal CC7 is switched to the LOW level, and detects that the lens microcomputer 114 is activated. That is, the lens microcomputer 114 notifies the camera microcomputer 34 that it has started normally by switching the polarity of the first communication port LP1 to the LOW level. The lens microcomputer 114 switches the polarity of the first communication port LP1 to the LOW level after a predetermined time has elapsed since the start.

<Determination of whether or not the interchangeable lens is genuine>
The camera microcomputer 34 determines whether the mounted interchangeable lens 100 is a regular interchangeable lens based on the polarity of a specific terminal of the camera side terminal group CCG. The specific terminal here is a terminal connected to the terminal to which the pull-up resistors LR7, LR8, and LR12 are connected and a terminal to which the pull-down resistor LR9 is connected on the interchangeable lens side.

Also, on the interchangeable lens side, the terminal to which the pull-down resistor LR9 is connected is the ninth terminal LC9. The camera-side terminal connected to this terminal is a ninth terminal CC9.

The camera microcomputer 34 includes a first communication port CP1 connected to the seventh terminal CC7 of the camera side terminal group CCG, and a second communication port CP2 connected to the eighth terminal CC8 of the camera side terminal group CCG. The polarities of the third communication port CP3 connected to the ninth terminal CC9 of the camera side terminal group CCG and the sixth communication port CP6 connected to the twelfth terminal CC12 of the camera side terminal group CCG (HIGH level or LOW level) is determined, and it is determined whether or not the mounted interchangeable lens 100 is a regular interchangeable lens. Specifically, the polarity of the first communication port CP1, the second communication port CP2, and the sixth communication port CP6 is HIGH, and the polarity of the third communication port CP3 is LOW. When the level is detected, it is determined that the attached interchangeable lens 100 is a regular interchangeable lens.

Thus, by determining the polarity of a specific terminal when the interchangeable lens 100 is mounted, it is possible to easily determine whether or not the mounted interchangeable lens 100 is a regular interchangeable lens.

<Compatibility determination>
When the interchangeable lens 100 is attached to the camera 10, it is determined whether or not the camera 10 and the interchangeable lens 100 are compatible. That is, it is determined whether or not the other party supports a specific function in both the camera 10 and the interchangeable lens 100. As described above, in the camera system 1 according to the present embodiment, the camera is connected from the interchangeable lens 100 to the camera using the camera side extended communication terminal (the twelfth terminal CC12) and the lens side extended communication terminal (the twelfth terminal LC12). A function for transmitting lens information to 10 is set as a function to be determined, and whether or not the function is supported is determined. Hereinafter, the specific function to be determined is referred to as a lens information acquisition function. The determination is performed according to the following procedure.

<Setting the polarity on the camera>
The camera microcomputer 34 functioning as the camera-side communication terminal polarity setting unit 70 sets the polarity of the fifth communication port CP5 at the timing when the supply of lens driving power to the interchangeable lens 100 is started.

Here, when the camera 10 is compatible with the lens information acquisition function, the camera microcomputer 34 sets the polarity of the fifth communication port CP5 to the HIGH level that is the first polarity. On the other hand, when the camera 10 does not support the lens information acquisition function, the camera microcomputer 34 sets the polarity of the fifth communication port CP5 to the LOW level that is the second polarity.

When the polarity of the fifth communication port CP5 is set to HIGH level (first polarity), the eleventh terminal CC11 which is the camera side communication terminal is set to HIGH level (first polarity). Further, when the polarity of the fifth communication port CP5 is set to the LOW level (second polarity), the eleventh terminal CC11 is set to the LOW level (second polarity).

<Setting the polarity on the lens>
The lens microcomputer 114 functioning as the lens-side communication terminal polarity setting unit 130 sets the polarity of the fifth communication port LP5 at the start timing. As described above, since the lens microcomputer 114 is activated when the power is normally supplied, the polarity of the fifth communication port LP5 is set at the activation timing. More specifically, the polarity of the fifth communication port LP5 is set after the activation but before notifying the camera side of the activation.

Here, when the interchangeable lens 100 is compatible with the lens information acquisition function, the lens microcomputer 114 sets the polarity of the fifth communication port LP5 to the HIGH level that is the first polarity. On the other hand, when the interchangeable lens 100 does not support the lens information acquisition function, the lens microcomputer 114 sets the polarity of the fifth communication port LP5 to the LOW level that is the second polarity.

When the polarity of the fifth communication port CP5 is set to HIGH level (first polarity), the eleventh terminal LC11 that is the lens side communication terminal is set to HIGH level (first polarity). Further, when the polarity of the fifth communication port CP5 is set to the LOW level (second polarity), the eleventh terminal LC11 is set to the LOW level (second polarity).

<Compatibility determination on the camera>
The camera microcomputer 34 functioning as the camera-side determination unit 72 detects the polarity of the fifth communication port CP5 (the eleventh terminal CC11) at the timing at which it is detected that the lens microcomputer 114 is activated, and determines whether there is compatibility. judge. Specifically, the polarity of the fifth communication port CP5 is detected at the timing when it is detected that the first communication port CP1 is switched to the LOW level, and the compatibility is determined.

As described above, the fifth communication port CP5 becomes the HIGH level only when the fifth communication ports CP5 and LP5 are set to the HIGH level in both the camera 10 and the interchangeable lens 100. The case where the fifth communication ports CP5 and LP5 are set to the HIGH level in both the camera 10 and the interchangeable lens 100 means that both the camera 10 and the interchangeable lens 100 support the lens information acquisition function. It is. Therefore, the camera microcomputer 34 determines that the attached interchangeable lens 100 is compatible with the lens information acquisition function when the polarity of the fifth communication port CP5 is HIGH. On the other hand, when the polarity of the fifth communication port CP5 is LOW level, it is determined that there is no compatibility. In the case of incompatibility, the camera side does not support the lens information acquisition function, the interchangeable lens side does not support the lens information acquisition function, or both the camera side and the interchangeable lens side are lenses. This is a case where the information acquisition function is not supported.

<Compatibility determination on the interchangeable lens side>
The lens microcomputer 114 functioning as the lens-side determining unit 132 detects the polarity of the fifth communication port LP5 (the eleventh terminal LC11) at the timing of notifying activation and determines the compatibility. Specifically, the polarity of the fifth communication port LP5 is detected at the timing of switching the first communication port LP1 to the LOW level, and the compatibility is determined.

Similar to the camera side, the fifth communication port LP5 on the interchangeable lens side is at the HIGH level only when the fifth communication ports CP5 and LP5 are set to the HIGH level in both the camera 10 and the interchangeable lens 100. become. As described above, the case where the fifth communication ports CP5 and LP5 are set to the HIGH level in both the camera 10 and the interchangeable lens 100 corresponds to the lens information acquisition function in both the camera 10 and the interchangeable lens 100. It is the case. Therefore, when the polarity of the fifth communication port LP5 is HIGH level, the lens microcomputer 114 determines that the mounting destination camera 10 is compatible with the lens information acquisition function. On the other hand, when the polarity of the fifth communication port LP5 is LOW level, it is determined that there is no compatibility. In the case of incompatibility, the camera side does not support the lens information acquisition function, the interchangeable lens side does not support the lens information acquisition function, or both the camera side and the interchangeable lens side are lenses. This is a case where the information acquisition function is not supported.

As described above, the camera 10 detects the polarity of the fifth communication port CP5 (the eleventh terminal CC11) on the camera side and the polarity of the fifth communication port LP5 (the eleventh terminal LC11) on the interchangeable lens side. In addition, it is possible to determine whether or not the interchangeable lens 100 is compatible.

<Judgment example>
Consider a case where the camera system 1 is composed of three cameras and three interchangeable lenses. The three cameras are a first camera, a second camera, and a third camera, and the three interchangeable lenses are a first interchangeable lens, a second interchangeable lens, and a third interchangeable lens. As for the camera, only the first camera corresponds to a specific function, and the other does not correspond to a specific function. As for the interchangeable lens, only the first interchangeable lens corresponds to a specific function, and the other does not correspond to a specific function.

In this case, the polarity of the fifth communication ports CP5 and LP5 becomes HIGH level only when the first camera and the first interchangeable lens are combined. Other combinations, that is, the first camera and the second interchangeable lens, the first camera and the third interchangeable lens, the second camera and the first interchangeable lens, the second camera and the second interchangeable lens, the second camera and the third interchangeable lens In the combination of the third camera and the first interchangeable lens, the third camera and the second interchangeable lens, and the third camera and the third interchangeable lens, the polarities of the fifth communication ports CP5 and LP5 are all set to the LOW level. Become.

Therefore, if both the camera and the interchangeable lens detect the polarities of the fifth communication ports CP5 and LP5, it is possible to determine whether the camera 10 and the interchangeable lens 100 are compatible. Specifically, when the polarity of the fifth communication ports CP5 and LP5 is HIGH in both the camera and the interchangeable lens, it can be determined that both the camera and the interchangeable lens are compatible with a specific function. On the other hand, when the polarity of the fifth communication ports CP5 and LP5 is LOW in both the camera and the interchangeable lens, it can be determined that at least one of them does not correspond to a specific function. That is, it can be determined that there is no compatibility.

<Lens information acquisition>
When both the camera 10 and the interchangeable lens 100 are compatible with the lens information acquisition function, that is, when both are compatible, lens information acquisition processing is performed.

Lens information acquisition processing is performed by transmitting lens information from the interchangeable lens 100 to the camera 10 and receiving it by the camera 10. The transmission of the lens information is performed by single-wire serial communication, and is performed using the camera side extended communication terminal (the twelfth terminal CC12) and the lens side extended communication terminal (the twelfth terminal LC12).

Here, the lens information is information indicating the specification of the interchangeable lens 100. The lens information includes, for example, lens model data, lens characteristic data, lens characteristic correction data, and the like. The lens model data includes the lens model name, focal length, open F value, manufacturer name, product ID (ID: Identification), and the like. The lens characteristic data includes luminance shading data, color shading data, distortion data, aberration data, and the like. The lens characteristic correction data includes luminance shading correction data, color shading correction data, distortion correction data, aberration correction data, and the like. The lens information is stored in the ROM of the lens microcomputer 114.

The lens information acquisition process is performed according to the following procedure.

In the above compatibility determination, if it is determined that the camera 10 as the mounting destination is compatible with the lens information acquisition function, communication settings for performing single-wire serial communication are performed. The communication settings are performed in order, and after the communication setting on the camera side is performed, the communication setting on the interchangeable lens side is performed. The communication setting on the camera side is performed before the communication setting on the interchangeable lens side in order to ensure that the communication setting on the camera side is completed when the interchangeable lens starts communication.

When the communication setting is completed, the lens microcomputer 114 outputs lens information from the sixth communication port LP6 (TXD port).

The lens information output from the sixth communication port LP6 of the lens microcomputer 114 is transmitted to the camera side via the twelfth terminal LC12 which is a lens side extended communication terminal.

The lens information transmitted to the camera side is received via the twelfth terminal CC12, which is a camera side extended communication terminal, and input to the sixth communication port CP6 (RXD port) of the camera microcomputer 34. Thereby, the lens information of the mounted interchangeable lens 100 is acquired on the camera side.

The acquired lens information is used for controlling the interchangeable lens 100 and the like.

<Communication settings>
After determining compatibility, communication settings are performed in both the camera 10 and the interchangeable lens 100. Specifically, various settings necessary for performing three-wire serial communication between the camera 10 and the interchangeable lens 100 are performed.

The communication settings are performed in order, and after the communication settings on the interchangeable lens side are performed, the communication settings on the camera side are performed. More specifically, after a certain time (for example, 2.5 ms) has elapsed after the determination of compatibility, communication settings on the interchangeable lens side are performed, and when a certain time (for example, 2.5 ms) has elapsed, Communication settings on the camera side are performed. Thereby, the communication setting can be surely completed before the camera starts communication. As described above, the camera system 1 according to the present embodiment performs three-wire serial communication with the camera as the SPI master and the interchangeable lens as the SPI slave. Accordingly, the camera side has a trigger for starting communication. As described above, by performing the communication setting on the interchangeable lens side before the communication setting on the camera side, it is possible to reliably complete the communication setting on the interchangeable lens side before the camera starts communication. As a result, reliable communication can be realized and the time to start communication can be shortened.

The lens microcomputer 114 performs various settings necessary for performing three-wire serial communication with the camera microcomputer 34 after a predetermined time has elapsed after determining compatibility. When a predetermined time further elapses, the camera microcomputer 34 performs various settings necessary for performing three-wire serial communication with the lens microcomputer 114.

This communication setting process is performed in parallel with the lens information acquisition process described above. Thereby, start-up can be speeded up.

<Switching the use of the camera side extended communication terminal and lens side extended communication terminal>
After the lens information is acquired, the camera side extended communication terminal (the twelfth terminal CC12) and the lens side extended communication terminal (the twelfth terminal LC12) are used for other purposes. Specifically, it is used as a terminal for notifying the camera 10 of the state of the interchangeable lens 100 from the interchangeable lens 100.

When the transmission of the lens information is completed, the lens microcomputer 114 performs settings necessary for using the lens side extended communication terminal (the twelfth terminal LC12) as a communication terminal for status notification. Similarly, the camera microcomputer 34 performs setting in order to use the camera side extended communication terminal (the twelfth terminal CC12) as a communication terminal for state notification.

This enables effective use of the camera side extended communication terminal and the lens side extended communication terminal even after transmission of lens information.

The same processing is performed when the camera 10 or the interchangeable lens 100 does not support the lens information acquisition function. That is, settings necessary for use as a terminal for notifying the state of the interchangeable lens 100 are performed.

<Drive of interchangeable lens>
When communication between the camera microcomputer 34 and the lens microcomputer 114 is established, the interchangeable lens 100 enters a standby state. Thereafter, the operation becomes possible in accordance with an instruction from the camera 10.

The lens microcomputer 114 communicates with the camera microcomputer 34 using a terminal for synchronous serial communication, and receives a drive instruction from the camera microcomputer 34. And according to the received instruction | indication, the lens drive part 110 is controlled and the interchangeable lens 100 is operated.

At this time, the lens driving unit 110 operates by receiving power from the camera 10. A plurality of lens driving power sources are supplied via a plurality of power source terminals (second terminal CC2 to fourth terminal CC4 on the camera side and second terminal LC2 to fourth terminal LC4 on the interchangeable lens side). The lens driving power supplies LV1, LV2, and LV3 have different voltages from each other and are supplied to the corresponding driving units. For example, in the interchangeable lens 100 including the focus driving unit 110A and the aperture driving unit 110C, the first lens driving power supply LV1 (+ 5V) having the lowest voltage is supplied to the aperture driving unit 110C. The third lens driving power supply LV3 (+10 V) having the highest voltage is supplied to the focus driving unit 110A.

In this way, by supplying the power of the voltage corresponding to each driving unit from the camera side, it is not necessary to generate a power source on the interchangeable lens side, and the configuration of the interchangeable lens 100 can be simplified. Further, since noise countermeasures are not required, the configuration can be further simplified.

Furthermore, power can be efficiently supplied by supplying power to the interchangeable lens through a plurality of power terminals. For example, when a large power supply is required on the interchangeable lens side, if the power is supplied from one power supply terminal, the loss at the terminal portion increases. However, by adopting a configuration in which the interchangeable lens is supplied via a plurality of power supply terminals, loss at the terminal portion can be reduced and power can be supplied efficiently. That is, by providing the interchangeable lens via a plurality of power supply terminals, the terminal area can be increased, and loss can be reduced and power can be supplied efficiently.

On the other hand, the number of power supply terminals increases, but in the camera system 1 of the present embodiment, the number of terminals for system power supply can be reduced, so that the increase in the number of terminals can also be suppressed.

<Individual ON / OFF of lens drive power supply>
As described above, the interchangeable lens 100 is supplied with a plurality of lens driving power sources having different voltages from the camera 10.

However, depending on the interchangeable lens 100, not all lens driving power sources are necessarily used, and only some lens driving power sources may be used. For example, when each driving unit operates at the same operating voltage, a lens driving power supply other than the operating voltage is not used.

Therefore, the power for driving the lens that is not used on the interchangeable lens side is stopped. Thereby, power saving can be achieved.

The voltage driving power required for the lens varies depending on the interchangeable lens. Based on the lens information acquired from the interchangeable lens 100, the camera microcomputer 34 determines a lens driving power source having a necessary voltage and causes the power supply unit 42 to supply only a lens driving power source having a necessary voltage. Specifically, the process is as follows.

First, based on the lens information acquired from the interchangeable lens 100, a lens driving power source having a voltage necessary for the mounted interchangeable lens 100 is determined. The ROM provided in the camera microcomputer 34 stores a determination table. The camera microcomputer 34 refers to the determination table to determine the lens driving power source having a voltage required for the mounted interchangeable lens 100. . In the determination table, information about a lens driving power source having a necessary voltage is recorded in association with each interchangeable lens (lens model name) constituting the camera system 1.

Next, the camera microcomputer 34 controls the lens driving power switch unit 44 based on the determination result, and stops the supply of unused lens driving power on the interchangeable lens side. For example, when the second lens driving power source LV2 that is an intermediate voltage is unused on the interchangeable lens side, the supply of the second lens driving power source LV2 is stopped. As a result, only necessary lens driving power is supplied.

Note that the first lens driving power supply LV1 having the lowest voltage is a lens driving power supply that is always used because it is used as the system power supply of the lens microcomputer 114. Accordingly, the supply is actually stopped for the second lens driving power supply LV2 which is an intermediate voltage or the third lens driving power supply LV3 having the highest voltage.

Thus, by stopping the supply of unused lens driving power on the interchangeable lens side, power can be supplied efficiently and power saving can be achieved.

In this example, the lens driving power source having the necessary voltage is determined with reference to the determination table provided on the camera side. However, the lens driving power having the necessary voltage for the lens information transmitted from the interchangeable lens is used. A power supply may be included.

<Removing the interchangeable lens>
When the interchangeable lens 100 is removed from the camera 10, the interchangeable lens 100 is rotated in the direction opposite to that when the interchangeable lens 100 is attached and is detached from the camera 10. At this time, the power supply terminals (second terminal LC2, third terminal LC3 and fourth terminal LC4) of the interchangeable lens 100 are connected to the ground terminals (fifth terminal LC5 and sixth terminal LC6) of the interchangeable lens 100. On the other hand, the replacement lens 100 can be safely removed by being arranged on the rear side in the rotation direction (the front side with respect to the rotation direction R when the interchangeable lens 100 is mounted).

That is, since the power supply terminal is disposed adjacent to the rear side of the ground terminal with respect to the rotation direction when the interchangeable lens 100 is removed, when the interchangeable lens 100 is rotated in the removal direction, the interchangeable lens 100 is immediately after. The power supply terminal is in contact with the ground terminal of the camera 10. That is, the power supply terminal of the interchangeable lens 100 is in contact with the ground terminal of the camera 10 without touching other terminals. Thereby, the charge remaining on the power supply terminal and its wiring can be appropriately processed, and the interchangeable lens 100 can be safely removed.

In addition, the plurality of power terminals are arranged in order of increasing voltage with respect to the rotation direction when the interchangeable lens 100 is removed (in order of decreasing voltage relative to the rotation direction R when the interchangeable lens 100 is attached). Thus, even if the power supply terminals are in contact with each other, the charge remaining on the interchangeable lens side can be appropriately processed. That is, when the interchangeable lens 100 is rotated to remove, the interchangeable lens-side power terminal always comes into contact with the camera-side power supply terminal or ground terminal that supplies power having a higher voltage than itself. Even if electric charges remain in the power supply terminal and its wiring on the side, it can be appropriately processed. Thereby, the interchangeable lens 100 can be removed safely.

◆◆ Second embodiment ◆◆
[Camera system configuration]
FIG. 12 is a system configuration diagram of a second embodiment of the interchangeable lens camera system.

As shown in the figure, the camera system 1 according to the present embodiment further includes an accessory 200 that is detachably mounted between the camera 10 and the interchangeable lens 100. At least one accessory 200 is provided. In the present embodiment, two accessories 200 are provided. The accessory 200 is composed of, for example, an extender and an extension tube. In the present embodiment, the two accessories 200 are both constituted by extenders. In this case, the accessory 200 is provided with an extender lens in its lens barrel. One of the two accessories 200 is configured by an extender that extends the focal length by 1.4 times, and the other is configured by an extender that extends the focal length by two times.

In the camera system 1 of the present embodiment, the presence / absence of correspondence to a function communicating with the accessory 200 is determined as the presence / absence of correspondence to a specific function. That is, some cameras 10 and interchangeable lenses 100 have a function of communicating with the accessory 200, and both the camera 10 and the interchangeable lens 100 determine whether or not the functions are supported.

<< Appearance structure of accessories >>
The accessory 200 includes an accessory-side first mount 204A on the proximal end side of the accessory body 202, and an accessory-side second mount 204B on the distal end side.

The accessory side first mount 204 A is a mount for mounting the accessory 200 to the camera 10. The accessory-side first mount 204 A has the same structure as the lens-side mount 104 provided in the interchangeable lens 100.

The accessory side second mount 204 B is a mount for mounting the interchangeable lens 100 on the accessory 200. The accessory-side second mount 204 B has the same structure as the camera-side mount 14 provided in the camera 10.

The accessory 200 is attached to the camera 10 via the accessory-side first mount 204A. In the camera 10 to which the accessory 200 is attached, the interchangeable lens 100 is attached to the accessory-side second mount 204B of the accessory 200.

<Electrical configuration of accessories>
FIG. 13 is a diagram illustrating an electrical configuration of the accessory.

<Accessory side first terminal group and accessory side second terminal group>
(A) Accessory-side first terminal group The accessory-side first mount 204A of the accessory 200 includes an accessory-side first terminal group A1CG including a plurality of terminals A1C1 to A1C12. The accessory-side first terminal group A1CG is provided corresponding to the camera-side terminal group CCG. Therefore, it is configured with the same number of terminals as the terminals constituting the camera side terminal group CCG, and the terminals A1C1 to A1C12 are arranged at the same intervals as the terminals CC1 to CC12 constituting the camera side terminal group CCG.

When the accessory 200 is attached to the camera 10, the terminals A1C1 to A1C12 of the accessory side first terminal group A1CG are connected to the corresponding terminals CC1 to CC12 of the camera side terminal group CCG. That is, the first terminal A1C1 of the accessory side first terminal group A1CG is connected to the first terminal CC1 of the camera side terminal group CCG, and the second terminal A1C2 of the accessory side first terminal group A1CG is the camera side terminal group CCG. The twelfth terminal A1C12 of the accessory side first terminal group A1CG is connected to the twelfth terminal CC12 of the camera side terminal group CCG.

Since the first terminal CC1 of the camera side terminal group CCG constitutes a lens detection terminal, the first terminal A1C1 of the accessory side first terminal group A1CG also constitutes a lens detection terminal.

Further, since the second terminal CC2, the third terminal CC3, and the fourth terminal CC4 of the camera side terminal group CCG constitute a power supply terminal, respectively, the second terminal A1C2, the second terminal A1C2, and the second terminal A1CG of the accessory side first terminal group A1CG. The third terminal A1C3 and the fourth terminal A1C4 also constitute corresponding power supply terminals.

The second terminal A1C2 is a terminal that supplies the lowest voltage lens driving power source LV1, and the fourth terminal A1C4 is a terminal that supplies the highest voltage lens driving power source LV3. The third terminal A1C3 is a terminal that supplies the lens driving power supply LV2 having an intermediate voltage.

In addition, since the fifth terminal CC5 and the sixth terminal CC6 of the camera side terminal group CCG constitute a ground terminal, respectively, the fifth terminal A1C5 and the sixth terminal A1C6 of the accessory side first terminal group A1CG also respectively. Configure the corresponding ground terminal.

Further, since the seventh terminal CC7 to the twelfth terminal CC12 of the camera side terminal group CCG constitute a communication terminal, respectively, the seventh terminal A1C7 to the twelfth terminal A1C12 of the accessory side first terminal group A1CG are also respectively provided. Configure the corresponding communication terminal. In particular, the twelfth terminal A1C12 constitutes an accessory-side first extended communication terminal. The twelfth terminal A1C12 is connected to the twelfth terminal CC12 of the camera 10 which is a camera side extended communication terminal when the accessory 200 is attached to the camera 10.

(B) Accessory-side second terminal group The accessory-side second mount 204B of the accessory 200 includes an accessory-side second terminal group A2CG including a plurality of terminals A2C1 to A2C12. The accessory-side second terminal group A2CG is provided corresponding to the lens-side terminal group LCG. Accordingly, it is configured with the same number of terminals as the terminals constituting the lens side terminal group LCG, and the terminals A2C1 to A2C12 are arranged at the same intervals as the terminals CC1 to CC12 constituting the lens side terminal group LCG.

When the interchangeable lens 100 is attached to the accessory 200, the terminals LC1 to LC12 of the lens side terminal group LCG are connected to the corresponding terminals A2C1 to A2C12 of the accessory side second terminal group A2CG. That is, the first terminal LC1 of the lens side terminal group LCG is connected to the first terminal A2C1 of the accessory side second terminal group A2CG, and the second terminal LC2 of the lens side terminal group LCG is connected to the accessory side second terminal group A2CG. The twelfth terminal LC12 of the lens side terminal group LCG is connected to the twelfth terminal A2C12 of the accessory side second terminal group A2CG.

Since the first terminal LC1 of the lens side terminal group LCG constitutes a lens detection terminal, the first terminal A2C1 of the accessory side second terminal group A2CG also constitutes a lens detection terminal.

Further, since the second terminal LC2, the third terminal LC3, and the fourth terminal LC4 of the lens side terminal group LCG constitute a power terminal, respectively, the second terminal A2C2, the second terminal A2C2, and the second terminal A2CG of the accessory side second terminal group A2CG. The third terminal A2C3 and the fourth terminal A2C4 also constitute corresponding power supply terminals.

The second terminal A2C2 is a terminal that supplies the lowest voltage lens driving power supply LV1, and the fourth terminal A2C4 is a terminal that supplies the highest voltage lens driving power supply LV3. The third terminal A2C3 is a terminal that supplies a lens driving power supply LV2 having an intermediate voltage.

Further, since the fifth terminal LC5 and the sixth terminal LC6 of the lens side terminal group LCG constitute a ground terminal, respectively, the fifth terminal A2C5 and the sixth terminal A2C6 of the accessory side second terminal group A2CG also respectively. Configure the corresponding ground terminal.

Further, since the seventh terminal LC7 to the twelfth terminal LC12 of the lens side terminal group LCG respectively constitute communication terminals, the seventh terminal A2C7 to the twelfth terminal A2C12 of the accessory side second terminal group A2CG are also respectively provided. Configure the corresponding communication terminal. In particular, the twelfth terminal A2C12 constitutes an accessory-side second extended communication terminal. The twelfth terminal A2C12 is connected to the twelfth terminal LC12 of the interchangeable lens 100 which is a lens side extended communication terminal when the interchangeable lens 100 is attached.

<Relationship between accessory side first terminal group and accessory side second terminal group>
(A) 1st terminal 1st terminal A1C1 which comprises a lens detection terminal in accessory side 1st terminal group A1CG and 1st terminal A2C1 which comprises a lens detection terminal in accessory side 2nd terminal group A2CG are in accessories. Are connected to each other by the first connection wiring AL1. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the first terminal CC1 of the camera 10 and the first terminal LC1 of the interchangeable lens 100 can be electrically connected.

(B) Second terminal to fourth terminal The first power supply terminal is configured in the second terminal A1C2 and the accessory second terminal group A2CG that configure the first power supply terminal in the accessory-side first terminal group A1CG. The second terminals A2C2 are connected to each other by the second connection wiring AL2 constituting the accessory-side power line in the accessory. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the second terminal CC2 of the camera 10 and the second terminal LC2 of the interchangeable lens 100 can be electrically connected. In this case, the second connection wiring AL2 functions as a wiring for supplying the first lens driving power supply LV1 having the lowest voltage from the camera 10 to the interchangeable lens 100.

The third terminal A1C3 constituting the second power supply terminal in the accessory-side first terminal group A1CG and the third terminal A2C3 constituting the second power supply terminal in the accessory-side second terminal group A2CG are accessories. They are connected to each other by the third connection wiring AL3 constituting the side power supply line. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the third terminal CC3 of the camera 10 and the third terminal LC3 of the interchangeable lens 100 can be electrically connected. In this case, the third connection wiring AL3 functions as a wiring for supplying the second lens driving power supply LV2 having an intermediate voltage from the camera 10 to the interchangeable lens 100.

The fourth terminal A1C4 constituting the third power supply terminal in the accessory-side first terminal group A1CG and the fourth terminal A2C4 constituting the third power supply terminal in the accessory-side second terminal group A2CG are accessories. They are connected to each other by a fourth connection wiring AL4 constituting the side power supply line. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the fourth terminal CC4 of the camera 10 and the fourth terminal LC4 of the interchangeable lens 100 can be electrically connected. In this case, the fourth connection wiring AL4 functions as a wiring for supplying the third lens driving power supply LV3 having the highest voltage from the camera 10 to the interchangeable lens 100.

(C) 5th terminal and 6th terminal A 2nd ground terminal is comprised in 6th terminal A1C6 and 2nd accessory side 2nd terminal group A2CG which comprise a 2nd ground terminal in accessory side 1st terminal group A1CG. The sixth terminals A2C6 are connected to each other by a sixth connection wiring AL6 constituting an accessory-side ground line in the accessory. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the sixth terminal CC6 of the camera 10 and the sixth terminal LC6 of the interchangeable lens 100 can be electrically connected.

In the accessory side first terminal group A1CG, the fifth terminal A1C5 constituting the first ground terminal and the fifth terminal A2C5 constituting the first ground terminal in the accessory side second terminal group A2CG are respectively in the accessory. The fifth connection wiring AL5A and AL5B are connected to the sixth connection wiring AL6. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the fifth terminal CC5 of the camera 10 and the fifth terminal LC5 of the interchangeable lens 100 can be electrically connected.

(D) Seventh terminal to twelfth terminal The seventh terminal A1C7 constituting the communication terminal in the accessory side first terminal group A1CG and the seventh terminal A2C7 constituting the communication terminal in the accessory side second terminal group A2CG are: In the accessory, they are connected to each other by the seventh connection wiring AL7 constituting the accessory-side communication line. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the seventh terminal CC7 of the camera 10 and the seventh terminal LC7 of the interchangeable lens 100 can be electrically connected.

The eighth terminal A1C8 constituting the communication terminal in the accessory-side first terminal group A1CG and the eighth terminal A2C8 constituting the communication terminal in the accessory-side second terminal group A2CG constitute the accessory-side communication line in the accessory. They are connected to each other by the eighth connection wiring AL8. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the eighth terminal CC8 of the camera 10 and the eighth terminal LC8 of the interchangeable lens 100 can be electrically connected.

The ninth terminal A1C9 constituting the communication terminal in the accessory-side first terminal group A1CG and the ninth terminal A2C9 constituting the communication terminal in the accessory-side second terminal group A2CG constitute the accessory-side communication line in the accessory. They are connected to each other by a ninth connection wiring AL9. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the ninth terminal CC9 of the camera 10 and the ninth terminal LC9 of the interchangeable lens 100 can be electrically connected.

The tenth terminal A1C10 constituting the communication terminal in the accessory-side first terminal group A1CG and the tenth terminal A2C10 constituting the communication terminal in the accessory-side second terminal group A2CG constitute the accessory-side communication line in the accessory. They are connected to each other by a tenth connection wiring AL10. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the tenth terminal CC10 of the camera 10 and the tenth terminal LC10 of the interchangeable lens 100 can be electrically connected.

The eleventh terminal A1C11 constituting the communication terminal in the accessory-side first terminal group A1CG and the eleventh terminal A2C11 constituting the communication terminal in the accessory-side second terminal group A2CG constitute the accessory-side communication line in the accessory. They are connected to each other by an eleventh connection wiring AL11. Thereby, even when the accessory 200 is mounted between the camera 10 and the interchangeable lens 100, the eleventh terminal CC11 of the camera 10 and the eleventh terminal CC11 of the interchangeable lens 100 can be electrically connected.

Here, since the ninth terminal, the tenth terminal, and the eleventh terminal are terminals used for three-wire serial communication, the ninth connection wiring AL9, the tenth connection wiring AL10, and the eleventh connection wiring are used. AL11 is used for 3-wire serial communication.

In the accessory side first terminal group A1CG, the twelfth terminal A1C12 constituting the accessory side first extended communication terminal and the twelfth terminal A2C12 constituting the accessory side second extended communication terminal in the accessory side second terminal group A2CG are accessories. Are connected to the accessory microcomputer 210 via the twelfth connection wirings AL12A and AL12B, respectively.

<Accessory microcomputer>
The accessory microcomputer 210 controls the operation of the accessory 200.

The accessory microcomputer 210 includes a CPU, a ROM, and a RAM, and provides various functions by executing a prescribed program. In addition to various programs executed by the CPU, various data necessary for control are stored in the ROM.

FIG. 14 is a block diagram showing an example of functions realized by the accessory microcomputer.

As shown in the figure, the accessory microcomputer 210 functions as an accessory communication unit 212, a bypass control unit 214, and the like by executing a prescribed program.

The accessory communication unit 212 communicates with the camera 10 and the interchangeable lens 100 to which the accessory 200 is attached. Communication is performed via the accessory microcomputer input / output port 216. The accessory microcomputer input / output port 216 includes a first port AP1 and a second port AP2 for performing single-line serial communication between the camera 10 and the interchangeable lens 100. The first port AP1 functions as a TXD port that outputs data. The first port AP1 is connected to the twelfth terminal A1C12 of the accessory-side first terminal group A1CG via the twelfth connection wiring AL12A (see FIG. 13). The second port AP2 functions as an RXD port that receives data. The second port AP2 is connected to the twelfth terminal A2C12 of the accessory-side second terminal group A2CG via the twelfth connection wiring AL12B (see FIG. 13).

Thus, the camera microcomputer 34 and the accessory microcomputer 210 are communicably connected via the twelfth terminal CC12 of the camera side terminal group CCG and the twelfth terminal A1C12 of the accessory side first terminal group A1CG. Further, the lens microcomputer 114 and the accessory microcomputer 210 are communicably connected via the twelfth terminal LC12 of the lens side terminal group LCG and the twelfth terminal A2C12 of the accessory side second terminal group A2CG.

The bypass control unit 214 is a control unit that controls on / off of a bypass mechanism for the camera microcomputer 34 and the lens microcomputer 114 to communicate without going through the accessory microcomputer 210. The bypass mechanism is configured as follows.

<Bypass mechanism>
(A) Configuration of Bypass Mechanism As shown in FIG. 13, an accessory microcomputer 210 is provided between the twelfth terminal A1C12 of the accessory-side first terminal group A1CG and the twelfth terminal A2C12 of the accessory-side second terminal group A2CG. The bypass line 232 is connected so as to avoid the above.

The bypass line 232 is connected to a first FET (FET: Field-Effect / Transistor / Field Effect Transistor) 234 as a first switch and a second FET 236 as a second switch.

The source terminal of the first FET 234 is connected to the twelfth terminal A1C12 of the accessory-side first terminal group A1CG via the bypass line 232. The drain terminal is connected to the drain terminal of the second FET 236 via the bypass line 232.

The source terminal of the second FET 236 is connected to the twelfth terminal A2C12 of the accessory-side second terminal group A2CG via the bypass line 232.

The gate terminal of each of the first FET 234 and the second FET 236 is connected to a wiring 238 that connects the second connection wiring AL2 and the sixth connection wiring AL6.

The third FET 240 as a third switch and a pull-up resistor 242 are connected to the wiring 238.

As described above, since the second connection wiring AL2 functions as a wiring for supplying the first lens driving power supply LV1 having the lowest voltage, the first FET 234 and the second FET 236 connected to the wiring 238 , Each gate terminal is pulled up to the potential of the first lens driving power supply LV1.

The drain terminal of the third FET 240 is connected to the pull-up resistor 242 via the wiring 238. The source terminal is connected to the sixth connection wiring AL6 through the wiring 238. Since the sixth connection wiring AL6 functions as a ground line, the source terminal of the third FET 240 is grounded.

The gate terminal of the third FET 240 is connected to the third port AP3 of the accessory microcomputer 210 via the wiring 244. The accessory microcomputer 210 functioning as the bypass control unit 214 controls the polarity (HIGH level or LOW level) of the third port AP3 to control on / off of the bypass mechanism.

(B) Operation of Bypass Mechanism When the accessory 200 is mounted, the mode in which the camera microcomputer 34 and the lens microcomputer 114 communicate via the accessory microcomputer 210 is the normal communication mode, and the camera microcomputer 34 and the lens microcomputer 114 are A mode in which communication is performed without going through the accessory microcomputer 210 is referred to as a bypass mode. In the normal communication mode, the bypass mechanism is turned off, and in the bypass mode, the bypass mechanism is turned on.

(1) Normal communication mode In the normal communication mode, the bypass mechanism is turned off. In this case, the accessory microcomputer 210 sets the polarity of the third port AP3 of the accessory microcomputer input / output port 216 to the HIGH level. As a result, the gate terminal of the third FET 240 is set to the HIGH level, and the third FET 240 as a switch is turned on.

On the other hand, when the third FET 240 as a switch is turned on, the gate terminals of the first FET 234 and the second FET 236 are set to the LOW level. Thereby, the first FET 234 and the second FET 236 as switches are turned off. As a result, the bypass line 232 is disconnected and the bypass mechanism is turned off.

Thereby, the camera microcomputer 34 and the lens microcomputer 114 can communicate with each other via the accessory microcomputer 210. More specifically, the accessory microcomputer 210 and the camera microcomputer 34 are communicably connected, and the accessory microcomputer 210 and the lens microcomputer 114 are communicably connected.

Note that the communication here is single-wire serial communication (unidirectional asynchronous serial communication using a single wire). In this case, data is transmitted from the lens microcomputer 114 to the accessory microcomputer 210, and data is transmitted from the accessory microcomputer 210 to the camera microcomputer 34.

(2) Bypass mode In the bypass mode, the bypass mechanism is turned on. In this case, the accessory microcomputer 210 sets the polarity of the third port AP3 of the accessory microcomputer input / output port 216 to the LOW level. Thereby, the third FET 240 as a switch is turned off.

On the other hand, when the third FET 240 as a switch is turned off, the gate terminals of the first FET 234 and the second FET 236 are set to the HIGH level. As a result, the first FET 234 and the second FET 236 as switches are turned on. As a result, the bypass line 232 is opened and the bypass mechanism is turned on.

Thereby, the camera microcomputer 34 and the lens microcomputer 114 are set to communicate directly without going through the accessory microcomputer 210.

<Accessory side system power generator>
A system power supply for operating the accessory microcomputer 210 is generated by an accessory-side system power generation unit 250 provided in the accessory. The accessory-side system power generation unit 250 generates the system power for the accessory microcomputer 210 using the lens driving power supplied from the camera 10, as with the lens-side system power generation unit 112 provided in the interchangeable lens 100. To do.

Here, the accessory microcomputer 210 is configured to operate at a voltage lower than that of each driving unit that constitutes the lens driving unit 110 provided in the interchangeable lens 100. For example, it is configured to operate at + 3.3V.

The accessory-side system power supply generation unit 250 uses the lens drive power supply LV1 (+5 V) having the lowest voltage among the plurality of lens drive power supplies LV1 to LV3 supplied from the camera 10 to use the system power supply ( + 3.3V). For this reason, the accessory side system power generation unit 250 is connected to the second connection wiring AL2 connected to the second terminal which is a power supply terminal.

Note that the accessory-side system power supply generation unit 250 also generates a system power supply by a voltage drop due to resistance, like the lens-side system power supply generation unit 112. Thereby, it is possible to prevent the occurrence of noise accompanying the generation of the system power supply. The accessory-side system power supply generation unit 250 is configured with, for example, an LDO regulator.

<Other configuration>
The twelfth terminal A1C12 of the accessory-side first terminal group A1CG is grounded via the pull-down resistor AR12 and pulled down to the ground potential. Thereby, when the accessory 200 is attached to the camera 10, the twelfth terminal CC12 of the camera 10 is set to the LOW level (second polarity). The camera microcomputer 34 can detect that the accessory 200 is attached to the camera 10 by detecting that the twelfth terminal CC12 is at the LOW level (second polarity).

The pull-down resistor AR12 connected to the twelfth terminal A1C12 of the accessory-side first terminal group A1CG has a larger resistance value than the pull-up resistor LR12 connected to the twelfth terminal LC12 of the interchangeable lens 100. For example, the pull-up resistor LR12 connected to the twelfth terminal LC12 of the interchangeable lens 100 is configured with 2.2 kΩ, and the pull-down resistor AR12 connected with the twelfth terminal A1C12 of the accessory side first terminal group A1CG is configured with 220 kΩ. . Thereby, for example, even when the mode of the accessory 200 is set to the bypass mode, the twelfth terminal CC12 of the camera 10 can be set to the LOW level (second polarity).

In this case, the pull-up resistor LR12 connected to the twelfth terminal LC12 (lens side extended communication terminal) of the interchangeable lens 100 functions as a lens side extended communication terminal polarity setting unit, and the twelfth terminal A1C12 (accessory of the accessory 200). Pull-down resistor AR12 connected to the first side extended communication terminal) functions as an accessory side first extended communication terminal polarity setting unit. The camera microcomputer 34 functions as an accessory detection unit. The function as the accessory detection unit is provided by the camera microcomputer 34 executing a predetermined program.

Further, the accessory microcomputer input / output port 216 of the accessory microcomputer 210 includes a fourth port AP4. The fourth port AP4 functions as an input communication port and is connected to the seventh connection wiring AL7 via the wiring 260. Thereby, the information transmitted via the seventh connection wiring AL7 can be received by the accessory microcomputer 210.

[Operation of camera system]
FIG. 15 is a diagram showing the electrical connection when accessories are mounted between the camera and the interchangeable lens.

《Attaching accessories》
The accessory 200 is attached to the camera 10 by attaching the accessory-side first mount 204 A provided in the accessory 200 to the camera-side mount 14 provided in the camera 10. At this time, the accessory 200 is rotated and attached to the camera 10.

Further, the interchangeable lens 100 is attached to the accessory 200 by attaching the lens side mount 104 provided in the interchangeable lens 100 to the accessory side second mount 204B provided in the accessory 200. At this time, the interchangeable lens 100 is rotated and attached to the accessory 200.

Thereby, the accessory 200 is mounted between the interchangeable lens 100 and the camera 10. By attaching the accessory 200, the lens side terminal group LCG of the interchangeable lens 100 is connected to the accessory side second terminal group A2CG of the accessory 200. Further, the camera side terminal group CCG of the camera 10 is connected to the accessory side first terminal group A1CG of the accessory 200.

《Electrical connection between camera and interchangeable lens》
(A) First Terminal When the accessory 200 is attached, the first terminal CC1 of the camera 10 that is a lens detection terminal is connected to the first terminal of the interchangeable lens 100 via the first connection wiring AL1 of the accessory 200. The terminal LC1 is electrically connected. Thereby, it is possible to detect the mounting of the interchangeable lens 100 in the camera 10.

(B) Second Terminal to Fourth Terminal By attaching the accessory 200, the second terminal CC2 of the camera 10 that is the first power supply terminal is connected via the second connection wiring AL2 of the accessory 200. , And electrically connected to the second terminal LC2 of the interchangeable lens 100. Further, the third terminal CC3 of the camera 10 which is the second power supply terminal is electrically connected to the third terminal LC3 of the interchangeable lens 100 via the third connection wiring AL3 of the accessory 200. Further, the fourth terminal CC4 of the camera 10 that is the third power supply terminal is electrically connected to the fourth terminal LC4 of the interchangeable lens 100 via the fourth connection wiring AL4 of the accessory 200.

Thereby, the lens driving power supplies LV1, LV2, and LV3 can be supplied from the camera 10 to the interchangeable lens 100.

(C) Fifth Terminal and Sixth Terminal When the accessory 200 is attached, the fifth terminal CC5 and the sixth terminal CC6 of the camera 10 that are ground terminals are connected to the fifth connection wiring AL5A of the accessory 200. , AL5B and the sixth connection wiring AL6 can be electrically connected to the fifth terminal LC5 and the sixth terminal LC6 of the interchangeable lens 100.

(D) Seventh terminal to twelfth terminal When the accessory 200 is attached, the seventh terminal CC7 to the eleventh terminal CC11 of the camera 10 which is a communication terminal are connected to the seventh connection wiring AL7 of the accessory 200. Are electrically connected to the seventh terminal LC7 to the eleventh terminal LC11 of the interchangeable lens 100 via the eleventh connection wiring AL11. As a result, three-wire serial communication or the like can be performed between the camera 10 and the interchangeable lens 100.

In addition, when the accessory 200 is attached, the twelfth terminal CC12 of the camera 10 that is the camera side extended communication terminal is connected to the twelfth terminal A1C12 and the twelfth connection of the accessory 200 that is the accessory side first extended communication terminal. It is electrically connected to the accessory microcomputer 210 via the wiring AL12A. The twelfth terminal LC12 of the interchangeable lens 100 that is the lens side extended communication terminal is connected to the accessory microcomputer 210 via the twelfth terminal A2C12 and the twelfth connection wiring AL12B of the accessory 200 that is the accessory side second extended communication terminal. And electrically connected. As a result, communication between the camera microcomputer 34 and the accessory microcomputer 210 becomes possible, and communication between the lens microcomputer 114 and the accessory microcomputer 210 becomes possible.

<Detection of wearing accessories>
As described above, the camera microcomputer 34 can detect the presence or absence of the accessory 200 by determining the polarity of the twelfth terminal CC12.

As described above, when the accessory 200 is attached to the camera 10, the twelfth terminal CC12 of the camera 10 is set to the LOW level. The camera microcomputer 34 determines that the accessory 200 is attached to the camera 10 by detecting that the twelfth terminal CC12 is at the LOW level.

<Activation of accessory microcomputer>
When the lens driving power supplies LV 1, LV 2, and LV 3 are supplied from the camera 10 to the interchangeable lens 100, some of them are supplied to the accessory-side system power generation unit 250. Specifically, the first lens driving power supply LV 1 (+5 V) having the lowest voltage is supplied to the accessory-side system power generation unit 250. The accessory-side system power generation unit 250 generates the system power (+3.3 V) of the accessory microcomputer 210 using the supplied lens driving power LV1 and supplies the system power to the accessory microcomputer 210. As a result, the accessory microcomputer 210 is activated.

<< Acquisition of accessory information >>
When the camera 10 and the interchangeable lens 100 have a function of communicating with the accessory 200, accessory information is transmitted from the accessory 200 to the camera 10.

Here, the accessory information is information indicating the specifications of the accessory 200. The accessory information includes, for example, accessory model data, accessory mounting position data, optical correction data, and the like. The accessory model data includes an accessory model name, an accessory type, a manufacturer name, a product ID, and the like. The accessory mounting position data includes effective accessory mounting position data, mounting number data, and the like. The optical correction data includes image correction data when an accessory is attached. The accessory information is stored in the ROM of the accessory microcomputer 210. The accessory 200 communicates with the camera microcomputer 34 and transmits accessory information to the camera microcomputer 34.

At this time, the accessory microcomputer 210 adds the accessory information to the lens information acquired in advance, and transmits the accessory information to the camera microcomputer 34. That is, the accessory microcomputer 210 communicates with the camera microcomputer 34 and communicates with the lens microcomputer 114 and acquires lens information from the lens microcomputer 114 before transmitting the accessory information to the camera microcomputer 34. Then, accessory information is added to the acquired lens information and transmitted to the camera microcomputer 34.

Incidentally, acquisition of lens information and accessory information by such a method can be realized only when both the camera 10 and the interchangeable lens 100 have a function of communicating with the accessory 200.

Therefore, when the camera 10 and the interchangeable lens 100 are attached, it is determined whether or not there is a function of communicating with the accessory 200 in both the camera 10 and the interchangeable lens 100 as determination of compatibility.

The specific determination method is the same as the method described in the first embodiment. That is, the polarities of the camera-side eleventh terminal CC11 that is the camera-side communication terminal and the eleventh terminal LC11 on the interchangeable lens side that is the lens-side communication terminal are detected, and are determined to be compatible when both are at the HIGH level. To do. That is, it is determined that both the camera 10 and the interchangeable lens 100 have a function of communicating with the accessory 200.

The polarity settings are as follows. That is, on the camera side, when the camera 10 has a function of communicating with the accessory 200, the polarity of the eleventh terminal CC11 is set to the HIGH level (first polarity). On the other hand, when the camera 10 does not have the function of communicating with the accessory 200, the polarity of the eleventh terminal CC11 is set to the LOW level (second polarity). On the interchangeable lens side, when the interchangeable lens 100 has a function of communicating with the accessory 200, the polarity of the eleventh terminal LC11 is set to HIGH level (first polarity). On the other hand, when the interchangeable lens 100 does not have a function of communicating with the accessory 200, the polarity of the eleventh terminal LC11 is set to the LOW level (second polarity).

In this case, the polarities of the eleventh terminals CC11 and LC11 become HIGH level (first polarity) only when both the mounted camera 10 and the interchangeable lens 100 have a function of communicating with the accessory 200.

The lens information and accessory information acquisition process is performed according to the following procedure.

If it is determined in the above compatibility determination that both the camera 10 and the interchangeable lens 100 have a function of communicating with the accessory 200, the lens microcomputer 114 switches the lens from the sixth communication port LP6 (TXD port). Output information.

The lens information transmitted to the camera side is received by the accessory microcomputer 210 via the twelfth terminal A2C12 of the accessory-side second terminal group A2CG of the accessory 200.

When the accessory microcomputer 210 receives lens information from the interchangeable lens 100, it adds its own accessory information to the lens information and transmits it to the camera 10. The transmitted information (lens information + accessory information) is output from the twelfth terminal A1C12 of the accessory-side first terminal group A1CG of the accessory 200, and is received by the camera microcomputer 34 via the twelfth terminal CC12 of the camera 10. The

Thereby, the camera 10 can acquire information of the attached accessory 200 and the interchangeable lens 100 at the same time.

If it is determined that the interchangeable lens 100 is directly attached to the camera 10 without attaching the accessory 200 and is compatible, only the lens information is obtained as in the first embodiment. Is transmitted to the camera 10.

<Communication settings>
Similar to the camera system 1 of the first embodiment, communication settings are performed in both the camera 10 and the interchangeable lens 100 after determining compatibility. The communication setting is performed in parallel with the lens information and accessory information acquisition process described above. Thereby, start-up can be speeded up.

<Switching the use of the camera side extended communication terminal and lens side extended communication terminal>
Similar to the camera system 1 of the first embodiment, after the lens information and the accessory information are acquired, the camera side extended communication terminal (the twelfth terminal CC12) and the lens side extended communication terminal (the twelfth terminal LC12) are acquired. ) Is used for other purposes. Specifically, it is used as a terminal for notifying the camera 10 of the state of the interchangeable lens 100 from the interchangeable lens 100. At this time, the accessory 200 is switched to the bypass mode. Thereby, the camera 10 and the interchangeable lens 100 can communicate directly, without going through the accessory 200.

◆◆ Other embodiments ◆◆
[Judgment target]
When determining the presence or absence of compatibility, the function to be determined is not particularly limited. The presence / absence of correspondence to a predetermined function is determined.

[Accessory detection]
In the above embodiment, the lens information is transmitted from the lens to the camera, and the accessory information is added to the lens information to detect the presence and type of the accessory. May be configured to perform accessory detection processing separately. For example, the configuration may be such that accessory detection data that does not include lens information is transmitted from the lens to the camera, and accessory information is added to the accessory detection data to detect the presence and type of the accessory. In this case, lens information is acquired separately. For example, it is acquired by three-wire serial communication. In this case, a transmission request for lens information is transmitted from the camera side to the lens side. In response to this transmission request, the lens side transmits lens information to the camera side.

[Configuration of camera side communication terminal and lens side communication terminal]
In the above embodiment, in order to enable compatibility determination based on the polarity of the terminal, both the camera side communication terminal and the lens side communication terminal are configured as terminals capable of open drain output. The configuration for enabling the compatibility determination based on this is not limited to this. In addition, for example, the same function can be realized by configuring both the camera side communication terminal and the lens side communication terminal with terminals capable of open collector output. The same function can also be realized by configuring one of the camera side communication terminal and the lens side communication terminal as a terminal capable of open drain output and configuring the other as a terminal capable of open collector output.

[Strengthening the lens drive power supply]
The power supply unit 42 may be configured to have a function of enhancing the supply capability of a specific power supply (supply capability enhancement function) so as to enhance the supply capability of the lens driving power supply. In this case, the power supply unit 42 is configured to enhance the supply capability of the lens driving power source having the highest voltage among the plurality of lens driving power sources to be supplied.

As an aspect for strengthening the supply capability, an aspect in which the supplied voltage is increased and / or an amount in which the supplied current is increased can be employed.

The camera microcomputer 34 enhances the supply capability of the lens driving power source with the highest voltage as necessary. For example, when an interchangeable lens that can improve the driving performance by strengthening the supply capability of the lens driving power supply is mounted, the supply capability of the lens driving power supply with the highest voltage is strengthened.

Whether or not the lens is an interchangeable lens that can improve the driving performance by strengthening the power supply capability of the lens driving power differs for each interchangeable lens. For interchangeable lenses that can improve driving performance by strengthening the supply capability of the lens driving power supply, the information is stored in the ROM of the lens microcomputer 114, and is included in the lens information and transmitted to the camera 10.

The camera microcomputer 34 determines, based on the acquired lens information, whether or not the mounted interchangeable lens is an interchangeable lens that can improve driving performance by enhancing the power supply capability of the lens driving power supply. That is, it is determined whether or not it is necessary to supply a lens driving power source with enhanced supply capability. Then, when it is determined that the lens driving power supply with enhanced supply capability is necessary, the supply capability enhancement function of the power supply unit 42 is operated. As a result, the power for driving the lens with the enhanced supply capability is supplied from the power supply unit 42. In this case, as described above, the lens driving power supply capability with the highest voltage is enhanced and supplied.

Thus, by strengthening the power supply capability of the lens driving power as necessary, it is possible to appropriately supply the necessary power for each interchangeable lens. This also makes it possible to improve the performance of the interchangeable lens.

[Camera system configuration]
In the above embodiment, the camera is a digital camera, but the present invention can also be applied to a so-called silver salt camera.

In the embodiment described above, an interchangeable lens having an AF function and an aperture has been described as an example of an interchangeable lens, but the function provided in the interchangeable lens is not limited to this. In addition, for example, an electric zoom function may be provided. An interchangeable lens having an electric zoom function includes a zoom driving unit that drives a zoom lens that is an optical member for zooming.

As described above, known accessories such as extenders and extension tubes can be used as accessories. When the accessory is provided with a drive unit, the drive unit is driven using a lens driving power source, as in the case of the interchangeable lens.

[Lens drive power supply type]
The type of lens driving power supplied from the camera to the interchangeable lens is appropriately set according to the interchangeable lens constituting the camera system. For example, one of the interchangeable lenses constituting the camera system includes four optical member driving units (for example, a focus driving unit, a camera shake correction mechanism driving unit, an aperture driving unit, and a zoom driving unit), each having a different operating voltage. In operation, four types of lens driving power are supplied from the camera. In this case, four terminals as power supply terminals are provided in the camera side terminal group and the lens side terminal group.

[Ground terminal]
In the above-described embodiment, two ground terminals are provided, but a single ground terminal may be used. Note that, by providing a plurality of ground terminals as in the camera system of the above embodiment, more stable power supply can be achieved.

In the above embodiment, two independent ground terminals are provided, but two ground terminals may be connected. Thereby, the area of a terminal can be expanded and more stable power supply becomes possible.

[Detection of normal system power supply to the lens microcomputer]
In the above embodiment, the polarity of a specific terminal is determined and it is detected that the system power is normally supplied to the lens microcomputer. However, at least one terminal for determining the polarity may be used. That is, at least one terminal on the interchangeable lens side needs to be pulled up to the potential of the system power supply via the pull-up resistor. In this case, at least one terminal excluding the power supply terminal and the ground terminal is used as a detection terminal.

Note that, as in the camera system 1 of the above-described embodiment, it is possible to more accurately detect that the system power is normally supplied to the lens microcomputer by determining the polarities of the plurality of terminals.

[Configuration to perform various processes]
In the above-described embodiment, the camera control unit that performs various processes is configured by a microcomputer (camera microcomputer). However, the hardware configuration for performing various processes is not limited thereto. Can be configured with various processors. Various processors can be changed in circuit configuration after manufacturing a CPU, FPGA (Field Programmable Gate Array), which is a general-purpose processor that functions as a processing unit that executes various processes by executing software (programs). Includes dedicated electrical circuits that are specially designed processors to execute specific processing such as PLD (PLD: Programmable Logic Device) and ASIC (ASIC: Application Specific Integrated Circuit) It is.

One processing unit may be composed of one of these various processors, or may be composed of two or more processors of the same type or different types. For example, it may be composed of a plurality of FPGAs or a combination of a CPU and FPGA.

In addition, a plurality of processing units may be configured with one processor. As an example of configuring a plurality of processing units with one processor, first, as represented by a computer such as a client or server, one processor is configured with a combination of one or more CPUs and software, There is a form in which this processor functions as a plurality of processing units. Secondly, as represented by a system-on-chip (SoC), a processor that implements the functions of the entire system including a plurality of processing units with a single IC chip (IC: integrated circuit) is used. There is a form. As described above, the various processing units are configured by using one or more of the various processors as a hardware structure.

Furthermore, the hardware structure of these various processors is more specifically an electric circuit in which circuit elements such as semiconductor elements are combined.

DESCRIPTION OF SYMBOLS 1 Camera system 10 Camera 12 Camera body 14 Camera side mount 16 Image sensor 18 Shutter 20 Image sensor drive part 22 Shutter drive part 24 Analog signal processing part 26 Display part 28 Image data storage part 30 Camera operation part 32 Power supply part 34 Camera microcomputer 40 Battery 42 Power supply unit 44 Lens drive power switch unit 50 Digital signal processing unit 52 Display control unit 54 Recording control unit 56 Power control unit 58 Lens drive power switch control unit 60 Lens mounting detection unit 62 Camera communication unit 64 Camera microcomputer input Output port 70 Camera side communication terminal polarity setting unit 72 Camera side determination unit 100 Interchangeable lens 102 Lens barrel 104 Lens side mount 106A Focus lens 106C Aperture 110 Lens drive unit 110A Focus drive unit 1 10C Aperture Drive Unit 112 Lens Side System Power Supply Generation Unit 114 Lens Microcomputer 120 Focus Drive Control Unit 124 Aperture Drive Control Unit 126 Lens Communication Unit 128 Lens Microcomputer Input / Output Port 130 Lens Side Communication Terminal Polarity Setting Unit 132 Lens Side Determination Unit 200 Accessories 202 Accessory body 204A Accessory side first mount 204B Accessory side second mount 210 Accessory microcomputer 212 Accessory communication unit 214 Bypass control unit 216 Accessory microcomputer input / output port 232 Bypass line 234 First FET
236 second FET
238 Wiring 240 Third FET
242 Pull-up resistor 244 Wiring 250 Accessory side system power generation unit 260 Wiring A1CG Accessory side first terminal group A1C1 First terminal A1C2 constituting the accessory side first terminal group Second terminal constituting the accessory side first terminal group A1C3 Third terminal A1C4 constituting the accessory side first terminal group Fourth terminal A1C5 constituting the accessory side first terminal group Fifth terminal A1C6 constituting the accessory side first terminal group A1C3 accessory side first terminal group 6th terminal A1C7 to configure 7th terminal A1C8 to configure the first terminal group on the accessory side 8th terminal A1C9 to configure the first terminal group on the accessory side 9th terminal A1C10 to configure the first terminal group on the accessory side 10th terminal A1C11 which comprises the side 1st terminal group Eleventh terminal A1C12 composing the first side terminal group twelfth terminal A2CG composing the first accessory terminal group A2C1 accessory side second terminal group A2C1 first terminal A2C2 composing the accessory side second terminal group Accessory side Second terminal A2C3 constituting the second terminal group Third terminal A2C4 constituting the accessory side second terminal group Fourth terminal A2C5 constituting the accessory side second terminal group Second terminal group constituting the accessory side second terminal group 5 terminal A2C6 6th terminal A2C7 constituting the accessory side second terminal group 7th terminal A2C8 constituting the accessory side second terminal group 8th terminal A2C9 constituting the accessory side second terminal group Ninth terminal A2C10 constituting the terminal group Tenth terminal A2C11 constituting the accessory-side second terminal group 11th terminal A2C12 constituting the accessory side second terminal group 12th terminal AL1 constituting the accessory side second terminal group 1st connection wiring AL2 for accessory 2nd connection wiring AL3 for accessory 3rd connection for accessory Wiring AL4 Accessory fourth connection wiring AL5A Accessory fifth connection wiring AL5B Accessory fifth connection wiring AL6 Accessory sixth connection wiring AL7 Accessory seventh connection wiring AL8 Accessory eighth connection wiring AL9 Accessory 9th connection wiring AL10 Accessory 10th connection wiring AL11 Accessory 11th connection wiring AL12A Accessory 12th connection wiring AL12B Accessory 12th connection wiring AP1 Accessory microcomputer first port AP2 Accessor -Second port AP3 of the microcomputer Third port AP4 of the accessory microcomputer Fourth port AR12 of the accessory microcomputer Pull-down resistor CCG Camera side terminal group CC1 First terminal CC2 constituting the camera side terminal group Configuring the camera side terminal group 2nd terminal CC3 3rd terminal CC4 which constitutes camera side terminal group 4th terminal CC5 which constitutes camera side terminal group 5th terminal CC6 which constitutes camera side terminal group 6th which constitutes camera side terminal group Terminal CC7 7th terminal CC8 constituting the camera side terminal group 8th terminal CC9 constituting the camera side terminal group 9th terminal CC10 constituting the camera side terminal group 10th terminal constituting the camera side terminal group CC11 Eleventh terminal constituting the camera side terminal group CC12 Twelfth terminal CP0 constituting the camera side terminal group Lens detection port CP1 Camera microcomputer first communication port CP2 Camera microcomputer second communication port CP3 Camera microcomputer third communication port CP4 Camera microcomputer fourth communication port CP5 Camera microcomputer Fifth communication port CP6 Sixth communication port CP7 of the camera microcomputer Seventh communication port CR1 of the camera microcomputer Pull-up resistor LCG Lens side terminal group LC1 First terminal LC2 constituting the lens side terminal group Lens side Second terminal LC3 constituting the terminal group Third terminal LC4 constituting the lens side terminal group Fourth terminal LC5 constituting the lens side terminal group Fifth terminal LC6 constituting the lens side terminal group Lens side terminal group The sixth terminal LC7 constituting the lens side terminal group The seventh terminal LC8 constituting the lens side terminal group 8 terminal LC9 9th terminal LC10 constituting the lens side terminal group 10th terminal LC11 constituting the lens side terminal group 11th terminal LC12 constituting the lens side terminal group 12th constituting the lens side terminal group Terminal LP1 First communication port LP2 of lens microcomputer Second communication port LP3 of lens microcomputer Third communication port LP4 of lens microcomputer Fourth communication port LP5 of lens microcomputer For fifth communication of lens microcomputer Port LP6 Sixth communication port LP7 of the lens microcomputer Seventh communication port LR1 of the lens microcomputer Pull-down resistor LR7 Pull-up resistor LR8 Pull-up resistor LR9 Pull-down resistor LR12 Pull-up resistor LV1 First lens driving power supply LV2 Second Lens drive power supply LV3 Third lens drive power supply R Rotation Direction

Claims

A camera system comprising a camera and an interchangeable lens detachably attached to the camera,
The camera
Camera side communication terminal,
A camera-side communication terminal polarity setting unit that sets the polarity of the camera-side communication terminal to the first polarity or the second polarity, and when the camera supports a specific function, sets the first polarity, If not compatible, the camera side communication terminal polarity setting unit to set the second polarity,
A camera-side determination unit that detects the polarity of the camera-side communication terminal and determines that the interchangeable lens corresponds to the specific function when the detected polarity is a first polarity;
With
The interchangeable lens is
A lens-side communication terminal connected to the camera-side communication terminal when mounted on the camera;
A lens-side communication terminal polarity setting unit that sets the polarity of the lens-side communication terminal to the first polarity or the second polarity, and is set to the first polarity when the interchangeable lens is compatible with the specific function If not compatible, the lens side communication terminal polarity setting unit to set the second polarity,
A lens side determination unit that detects the polarity of the lens side communication terminal and determines that the camera is compatible with the specific function when the detected polarity is a first polarity;
With
The camera side communication terminal and the lens side communication terminal are both set to the first polarity only when both are set to the first polarity and at least one is set to the second polarity. In both cases, both are of the second polarity,
Camera system.
The camera side communication terminal and the lens side communication terminal are each one of a plurality of terminals used when the camera and the interchangeable lens perform serial communication.
The camera further includes a camera-side communication setting unit configured to perform communication settings of a plurality of terminals used when serially communicating with the interchangeable lens after being determined by the camera-side determination unit.
The interchangeable lens further includes a lens-side communication setting unit configured to set communication of a plurality of terminals used when serially communicating with the camera after the determination by the lens-side determination unit.
The camera system according to claim 1.
An accessory that is detachably mounted between the camera and the interchangeable lens;
The specific function is a function of communicating with the attached accessory when the accessory is attached.
The camera system according to claim 1 or 2.
The camera further includes a camera side extended communication terminal,
The interchangeable lens further includes a lens side extended communication terminal connected to the camera side extended communication terminal when attached to the camera,
The accessory is connected to the accessory-side first extended communication terminal connected to the camera-side extended communication terminal when attached to the camera, and to the lens-side extended communication terminal when the interchangeable lens is attached. An accessory-side second extended communication terminal,
When the interchangeable lens is directly attached to the camera, the camera and the interchangeable lens communicate via the camera side extended communication terminal and the lens side extended communication terminal,
When the accessory is attached, and both the camera and the interchangeable lens support the specific function, the camera and the accessory are the camera side extended communication terminal and the accessory side first. Communicating via an extended communication terminal, the interchangeable lens and the accessory communicate via the lens side extended communication terminal and the accessory side second extended communication terminal,
The camera system according to claim 3.
When the accessory is attached, and both the camera and the interchangeable lens support the specific function, the camera has the camera side extended communication terminal and the accessory side first extended communication terminal. Communicates with the accessory via and obtains information on the accessory from the accessory,
The camera system according to claim 4.
When the accessory is attached and both the camera and the interchangeable lens support the specific function, the interchangeable lens is connected to the lens side extended communication terminal and the accessory side second extended communication. Communicating with the accessory via a terminal, and transmitting information about the interchangeable lens to the accessory, the accessory communicating with the camera via the accessory-side first extended communication terminal and the camera-side extended communication terminal, Adding the information of the accessory to the information of the interchangeable lens received from the interchangeable lens and transmitting the information to the camera;
The camera system according to claim 5.
After the camera acquires the accessory information, the interchangeable lens is connected via the camera side extended communication terminal, the accessory side first extended communication terminal, the accessory side second extended communication terminal, and the lens side extended communication terminal. And obtaining information on the status of the interchangeable lens from the interchangeable lens,
The camera system according to claim 5 or 6.
The interchangeable lens further includes a lens side extended communication terminal polarity setting unit that sets the polarity of the lens side extended communication terminal to a first polarity,
The accessory further includes an accessory-side first extended communication terminal polarity setting unit that sets the polarity of the accessory-side first extended communication terminal to a second polarity,
The camera further includes an accessory detection unit that detects the polarity of the camera side extended communication terminal and detects attachment of the accessory,
The accessory detection unit determines that the accessory is attached when the polarity of the camera side extended communication terminal is the first polarity, and when the polarity of the camera side extended communication terminal is the second polarity, the accessory is It is determined that the accessory is not attached and the attachment of the accessory is detected.
The camera system according to any one of claims 4 to 7.
A camera to which an interchangeable lens is detachably attached,
A camera-side communication terminal connected to a lens-side communication terminal provided in the interchangeable lens when the interchangeable lens is mounted;
A camera-side communication terminal polarity setting unit that sets the polarity of the camera-side communication terminal to the first polarity or the second polarity, and when the camera supports a specific function, sets the first polarity, If not compatible, the camera side communication terminal polarity setting unit to set the second polarity,
A camera-side determination unit that detects the polarity of the camera-side communication terminal and determines that the interchangeable lens corresponds to the specific function when the detected polarity is a first polarity;
With
When the interchangeable lens is compatible with the specific function, the polarity of the lens side communication terminal is set to the first polarity, and when not compatible, the polarity of the lens side communication terminal is set to the second polarity. And
The camera side communication terminal and the lens side communication terminal are both set to the first polarity only when both are set to the first polarity and at least one is set to the second polarity. In both cases, both are of the second polarity,
camera.
The camera side communication terminal is one of a plurality of terminals used when the camera serially communicates with the interchangeable lens,
A camera-side communication setting unit configured to perform communication settings of a plurality of terminals used when serially communicating with the interchangeable lens after the determination by the camera-side determination unit;
The camera according to claim 9.
An interchangeable lens that is detachably attached to the camera,
A lens-side communication terminal connected to a camera-side communication terminal provided in the camera when mounted on the camera;
A lens-side communication terminal polarity setting unit that sets the polarity of the lens-side communication terminal to the first polarity or the second polarity, and when the interchangeable lens supports a specific function, sets the first polarity. If not compatible, the lens side communication terminal polarity setting unit to set the second polarity,
A lens side determination unit that detects the polarity of the lens side communication terminal and determines that the camera is compatible with the specific function when the detected polarity is a first polarity;
With
When the camera is compatible with the specific function, the polarity of the camera side communication terminal is set to the first polarity, and when the camera is not compatible, the polarity of the camera side communication terminal is set to the second polarity. ,
The camera side communication terminal and the lens side communication terminal are both set to the first polarity only when both are set to the first polarity and at least one is set to the second polarity. In both cases, both are of the second polarity,
interchangeable lens.
The lens side communication terminal is one of a plurality of terminals used when the interchangeable lens performs serial communication with the camera.
A lens-side communication setting unit configured to perform communication settings of a plurality of terminals used when serially communicating with the camera after the determination by the lens-side determination unit;
The interchangeable lens according to claim 11.
A camera system compatibility determination method comprising a camera and an interchangeable lens detachably attached to the camera,
Attaching the interchangeable lens to the camera;
The step of setting the polarity of the camera side communication terminal provided in the camera to the first polarity or the second polarity, and when the camera supports a specific function, sets the polarity to the first polarity. If not, setting the second polarity;
The step of setting the polarity of the lens side communication terminal provided in the interchangeable lens to the first polarity or the second polarity, and when the interchangeable lens corresponds to the specific function, the first polarity is set. If not, the step of setting the second polarity,
The step of determining whether the interchangeable lens attached to the camera corresponds to the specific function based on the polarity of the camera side communication terminal, wherein the polarity of the camera side communication terminal is first. Determining that the interchangeable lens corresponds to the specific function in the case of polarity;
The step of determining whether the camera to which the interchangeable lens is attached corresponds to the specific function based on the polarity of the lens side communication terminal, wherein the polarity of the lens side communication terminal is the first Determining that the camera is compatible with the particular function in the case of polarity;
The camera side communication terminal and the lens side communication terminal are both set to the first polarity only when both are set to the first polarity and at least one is set to the second polarity. If set, both will have the second polarity,
Camera system compatibility judgment method.
The camera side communication terminal and the lens side communication terminal are one of a plurality of terminals used when the camera and the interchangeable lens perform serial communication.
Determining whether or not the interchangeable lens attached to the camera corresponds to the specific function; and whether or not the camera attached to the interchangeable lens corresponds to the specific function. The method further includes a step of performing communication settings of a plurality of terminals used when the camera and the interchangeable lens perform serial communication after the determining step.
The camera system compatibility determination method according to claim 13.
The camera system further includes an accessory that is detachably mounted between the camera and the interchangeable lens,
The specific function is a function of communicating with the attached accessory when the accessory is attached between the camera and the interchangeable lens.
15. A compatibility determination method for a camera system according to claim 13 or 14.
When the accessory is attached, and both the camera and the interchangeable lens support the specific function,
The camera and the accessory communicate with each other via the camera side extended communication terminal provided in the camera and the accessory side first extended communication terminal provided in the accessory;
The interchangeable lens and the accessory communicate with each other via the lens side extended communication terminal provided in the interchangeable lens and the accessory side second extended communication terminal provided in the accessory;
Further including
The compatibility determination method of the camera system according to claim 15.
In the step of communicating the interchangeable lens and the accessory, information on the interchangeable lens is transmitted to the accessory,
In the step of communicating between the camera and the accessory, information on the accessory is added to information on the interchangeable lens received from the interchangeable lens, and transmitted to the camera.
The camera system compatibility determination method according to claim 16.
After acquiring the information of the accessory and the information of the interchangeable lens, via the camera side extended communication terminal, the accessory side first extended communication terminal, the accessory side second extended communication terminal, and the lens side extended communication terminal, The camera and the interchangeable lens communicate with each other, and the camera further includes obtaining information on a state of the interchangeable lens;
The compatibility determination method of the camera system according to claim 17.